Takeru Tenkūji (天空寺 タケル Tenkūji Takeru) is an 18-year-old man who is the current heir to Daitenkū-ji. Ten years earlier, his father left him home as he went on a ghost hunting expedition. Before his father apparently died, he sent Takeru a gift of the tsuba from Miyamoto Musashi's katana which he wears on a necklace. As well as his interest in Miyamoto Musashi, Takeru enjoys reading from a book titled Stories of the World's Greatest People (世界偉人伝 Sekai Ijinden) and learning about the history and legends of famous historical figures. Wishing to follow in his father's footsteps as a ghost hunter, Takeru laments being unable to see ghosts, which neither Akari nor Onari believe exist, until he receives an item called a Ghost Eyecon (ゴースト眼魂 Gōsuto Aikon?)[b] on his 18th birthday, a gift meant for him should his father have truly died. This allows him to see the monstrous ghosts known as Gamma who then attack and kill him, as they are after the Eyecon themselves. He is brought back to life by a mysterious hermit who grants him the ability to transform into Kamen Rider Ghost to fight the Gamma. The hermit tells Takeru he has 99 days to gather the 15 heroic Eyecons of great men from history in order to fully come back to life through the monolith below Daitenkū-ji, as the hermit's magic is not powerful enough to truly restore him to life. However, after seeing his childhood friend Makoto Fukami become the cold Kamen Rider Specter as a result of his sister Kanon's body being trapped in the Gamma World. When all 15 heroic Eyecons are gathered by Chikara Saionji, Takeru's pure heart and willpower to be a Kamen Rider allows him to be uncorrupted by the monolith's magic and he passes on getting his life back so Kanon can be saved. During his first visit in the Gamma World, Takeru gains the ability to enter a person's memories by touching them. After finishing an investigation of the Gamma's plot on turning most of the middle aged adults into kids with the help of Tutankhanum to restore the victims' actual ages, Takeru hears an unknown female voice, later revealed to be his mother, thanking him when he said something about motherhood. His mother is revealed to have died when Takeru was born, and thus, he is unable to remember her face. As a child before his father's death, Takeru used to disrespect his father for involving him with his so-called expedition. When he later enters Igarashi's memories, he learns that his father kept him along on his expeditions as he saw a hidden infinite potential in him that would make peace with the Gamma World. The hermit also reveals to him that the Eyecon containing his soul was supposed to have contained his father's soul until his death at the hands of a Gamma, and that if he cannot restore his original body within another 99 days both his soul and his father's soul will disappear forever. When entering Adel's memories, Takeru finds out that Adel was the one who killed his father ten years ago, before he killed his own father Adonis years later in the present. However, Takeru notes that Adel's madness was because his and Alain's mother Alicia died in illness, which is why he tells Alain not to blame himself for what happened ten years ago. Once Takeru and his allies discover the true mastermind to be the Gammisers, as they were the ones manipulating Adel and creating Makoto's clones, he manages to defeat them possessing Adel's Perfect Gammiser form with Mugen Damashii, and then the Great Eyeser with both Mugen Damashii and Ore Damashii, thus saving the world. As a debt from the Great Eye for freeing them from the Gammisers and ever since the Great Eye began eyeing Takeru for his heroic deeds since their first meeting, Takeru is granted more than one wish besides reviving himself. Now that he's finally been revived, Takeru can continue his unfinished education in high school. Unfortunately, during Kamen Rider Heisei Generation: Dr. Pac-Man vs. Ex-Aid and Ghost with Heisei Riders, Takeru is afflicted with a Pac-Man based Bugster virus, causing him to die and be unable to transform into Ghost due to the virus in him disabling his Rider powers. He seeks CR's help at Seito University Hospital where Kamen Rider Ex-Aid is not only to save himself, but also the other victims infected by the Pac-Man Bugster virus, including his friend Akari, with help from Kamen Riders Drive, Gaim and Wizard.
As Kamen Rider Ghost, Takeru uses the Ghost Driver (ゴーストドライバー Gōsuto Doraibā) and the Ghost Eyecons to transform. Without an accompanying Eyecon containing the spirit of either himself or a historical figure, Ghost remains in a form called Transient (トランジェント Toranjento) which lacks any powers. However, the Eyecons call upon a spirit which takes on the form of a Hoodie Ghost (パーカーゴースト Pākā Gōsuto) and transforms Ghost into one of his Damashii (魂)[c] forms. In addition to special abilities, some Damashii forms come with their own unique weapons as part of the form itself. His primary form is known as Ore Damashii (オレ魂, My Damashii), accessed from the Ghost Eyecon which contains Takeru's own soul. Among Ghost's powers in this form is the ability to float, and his finishing move is the Omega Drive (オメガドライブ Omega Doraibu) Rider Kick. Ghost's main weapon is the Gan Gun Saber (ガンガンセイバー Gan Gan Seibā), which has multiple modes depending on which Damashii form he assumes. Its default Blade Mode's finishing move is the Omega Break (オメガブレイク Omega Bureiku), while its alternate Naginata Mode has the Omega Stream (オメガストリーム Omega Sutorīmu). His motorcycle is a Honda CRF250L called the Machine Ghostriker (マシンゴーストライカー Mashin Gōsutoraikā), which can combine with the Captain Ghost (キャプテンゴースト Kyaputen Gōsuto) flying ghost ship to become the Iguana Ghostriker (イグアナゴーストライカー Iguana Gōsutoraikā). When Takeru finds the spirit of a historical figure, it becomes another Ghost Eyecon for him and grants Ghost new powers:
- Toucon Musashi Damashii (闘魂ムサシ魂 Tōkon Musashi Damashii) is an evolved version of Musashi Damashii using the Toucon Boost Transient. In this form, Ghost dual wields the Gan Gun Saber in Blade Mode and the Sunglasseslasher in Sword Mode. This form's Omega Drive charges flame-like energy into the blades of both the Gan Gun Saber and the Sunglasseslasher before Ghost slashes the enemy with them.
- Edison Damashii (エジソン魂 Ejison Damashii) empowers Ghost with the spirit of the American inventor where he gains the ability to control electricity, making him immune to electric-based attacks as well as allowing him to absorb electrical energy to power his own attacks. In this form, he wields the Gan Gun Saber in Gun Mode which allows him to perform the Omega Shoot (オメガシュート Omega Shūto) finishing move. This form's Omega Drive charges electric-like energy into Ghost's foot before he strikes the enemy with a Rider Kick. After Specter defeats Ghost in their first fight, he steals this Eyecon and keeps it in his possession until the conflict between Takeru and Makoto is resolved. Edison speaks in both English and Japanese, and repeatedly announces "I am Edison" while fighting. In his original human body, Edison is portrayed by Chad Mullane (チャド・マレーン Chado Marēn) of the owarai duo Chad Mullane.
- Deep Specter Edison Damashii (ディープスペクターエジソン魂 Dīpu Supekutā Ejison Damashii) is an evolved version of Edison Damashii using the Deep Specter Transient. Deep Specter assumes this form once after Ghost lends the Edison Eyecon to him while in the middle of a battle where he wields the Gan Gun Hand in Gun Mode. This form's Omega Drive charges flaming electric-like energy into Deep Specter's foot before he strikes the enemy with a Rider Kick.
- Robin Damashii (ロビン魂) empowers Ghost with the spirit of the English vigilante where he gains expert archery skills. In this form, he wields the Gan Gun Saber in Arrow Mode after combining with the Condor Denwor (コンドルデンワー Kondoru Denwā)[d] which allows him to perform the Omega Strike (オメガストライク Omega Sutoraiku) finishing move. This form's Omega Drive creates several duplicates of Ghost who all shoot arrows at the enemy alongside him. Sometime after Alain reveals his new powers as Kamen Rider Necrom, Robin Hood brings Takeru into his Eyecon's world to explain to him that not all people follow the same path of justice, believing that Alain has his own path. In his original human body, Robin Hood is portrayed by Naoki Komatsu (小松 直樹 Komatsu Naoki).
- Toucon Robin Damashii (闘魂ロビン魂 Tōkon Robin Damashii) is an evolved version of Robin Damashii using the Toucon Boost Transient.
- Newton Damashii (ニュートン魂 Nyūton Damashii) empowers Ghost with the spirit of the English physicist where he gains the ability to control gravity with a pair of orbs on his hands, which he can also use as boxing gloves. This form's Omega Drive amplifies the energy in Ghost's orbs to create a powerful gravity pulse. Specter steals this Eyecon following a battle against the Machinegun Gamma, only for Ghost to reclaim it soon afterwards when the two Riders attack each other with their respective Rider Kicks. Newton is at odds with Himiko as he is a firm scientist and she is a mystical shaman, but Takeru helps him reconcile the differences between their powers. First used in Kamen Rider Drive: Surprise Future. During the final episode of Kamen Rider Drive, this Eyecon serves as an important object that temporarily falls under the possession of a criminal organization known as Neo-Shade until the former Kamen Rider Drive, Shinnosuke Tomari, retrieves it and returns it to Ghost.
- Beethoven Damashii (ベートーベン魂 Bētōben Damashii) empowers Ghost with the spirit of the German composer where he gains the ability to control music by manipulating soundwaves to form an invisible wall around himself that can even be used to reflect attacks back at the enemy. This form's Omega Drive produces musical notes for Ghost to launch as a series of projectiles. This Eyecon temporarily possesses Akari. In his original human body, Beethoven is portrayed by Show Ayanocozey (綾小路 翔 Ayanokōji Shō) of Kishidan.
- Toucon Beethoven Damashii (闘魂ベートーベン魂 Tōkon Bētōben Damashii) is an evolved version of Beethoven Damashii using the Toucon Boost Transient.
- Billy the Kid Damashii (ビリー・ザ・キッド魂 Birī Za Kiddo Damashii) empowers Ghost with the spirit of the American gunslinger where he gains expert sharpshooting skills. In this form, he can either dual wield the Gan Gun Saber and the Bat Clock (バットクロック Batto Kurokku) both in Gun Mode or wield the Gan Gun Saber in Rifle Mode after combining with the Bat Clock which allows him to perform the Omega Impact (オメガインパクト Omega Inpakuto) finishing move. This Eyecon temporarily possesses Kanon. Like Edison, Billy the Kid speaks in both English and Japanese. During the incident where detective Shinichirō Natsume arrests his partner Ryōsuke Shinozaki for treacherous actions against him and betraying the police force, Billy the Kid brings Takeru into his Eyecon's world to reminisce about how he was killed by his best friend Pat Garrett. This form is also used by Dark Necrom B in the film Kamen Rider Ghost the Movie: The 100 Eyecons and Ghost's Fated Moment.
- Toucon Billy the Kid Damashii (闘魂ビリー・ザ・キッド魂 Tōkon Birī Za Kiddo Damashii) is an evolved version of Billy the Kid Damashii using the Toucon Boost Transient. In this form, Ghost can dual wield either the Gan Gun Saber and the Bat Clock both in Gun Mode or one of the aforementioned weapons in Gun Mode and the Sunglasseslasher in Blaster Mode.
- Benkei Damashii (ベンケイ魂) empowers Ghost with the spirit of the Japanese warrior monk where he gains superhuman strength. In this form, he wields the Gan Gun Saber in Hammer Mode after combining with the Kumo Lantern (クモランタン Kumo Rantan, Spider Lantern) which allows him to perform the Omega Bomber (オメガボンバー Omega Bonbā) finishing move. This form's Omega Drive enlarges the Gan Gun Saber in Hammer Mode to a massive size before Ghost smashes the enemy with it. During the incident where Makoto was enslaved by Alain and Takeru tried to befriend the rogue Art Supplies Gamma, Benkei brings Takeru into his Eyecon's world to advise him to consider what other people have said while continuing his path. This form is also used by Dark Necrom R in the film Kamen Rider Ghost the Movie: The 100 Eyecons and Ghost's Fated Moment. In his original human body, Benkei is portrayed by Kenji Tominaga (富永 研司 Tominaga Kenji).
- Toucon Benkei Damashii (闘魂ベンケイ魂 Tōkon Benkei Damashii) is an evolved version of Benkei Damashii using the Toucon Boost Transient.
After nearly disappearing forever, Takeru's father Ryū Tenkūji's soul becomes a Ghost Eyecon that allows both Takeru to remain on Earth and Ghost to transform into Toucon Boost Damashii (闘魂ブースト魂 Tōkon Būsuto Damashii, Fighting Spirit Boost Damashii).[e] In this form, he gains both enhanced capabilities and a weapon called the Sunglasseslasher (サングラスラッシャー Sangurasurasshā) which can switch between Sword Mode and Blaster Mode. The Sunglasseslasher can hold two Eyecons for Ghost to perform one of two finishing moves: the Omega Shine (オメガシャイン Omega Shain) in its Sword Mode or the Omega Flash (オメガフラッシュ Omega Furasshu) in its Blaster Mode. Toucon Boost Damashii's ultimate attack is the Boost Omega Drive (ブーストオメガドライブ Būsuto Omega Doraibu), which has two variations for Ghost to use: a flame-powered Rider Kick/Punch or an energized slash/shot with the Sunglasseslasher. The Toucon Boost Eyecon revives Takeru for a second chance to live in the mortal world and find the missing Eyecons by extending his lifespan back to 99 days. Ghost's Toucon Boost Transient also serves as the basis for several more powerful Eyecons he acquires (though he can also use it to transform into stronger versions of either his other forms or his fellow Riders' heroic Damashii), although his Ore Transient can be used as a stand in for it. He is also still able to wield the Sunglasseslasher:
- Goemon Damashii (ゴエモン魂) empowers Ghost with the spirit of the Japanese outlaw where he gains increased ninjutsu-like agility. In this form, he wields the Sunglasseslasher in Sword Mode as a reverse grip which allows him to perform the Mega Omega Shine (メガオメガシャイン Mega Omega Shain) finishing move if he loads the Ore and Toucon Boost Eyecons into it. This Eyecon temporarily possesses Onari. After Ghost defeates Yamaarashi-Roid, Goemon asks Takeru if he believes Alain can be trusted to which he simply approves due to assistance he earlier received from Yamato Kazakiri/Zyuoh Eagle despite the two starting out as strangers to each other. In his original human body, Goemon is portrayed by Ami 201 (阿見 201 Ami Niimaruichi) of the owarai duo Dekobokodan.
- Goemon Damashii (Ore Base) (ゴエモン魂（オレベース) Goemon Damashii (Ore Bēsu)) is a devolved version of Goemon Damashii using the Ore Transient. This form's Omega Drive charges energy into the blade of the Sunglasseslasher in Sword Mode before Ghost slashes the enemy with it.
- Ryoma Damashii (リョウマ魂 Ryōma Damashii) empowers Ghost with the spirit of the Japanese samurai where he gains increased brawn. In this form, he can wield the Sunglasseslasher in either mode which allows him to perform the Mega Omega Flash (メガオメガフラッシュ Mega Omega Furasshu) finishing move if he loads the Ore and Toucon Boost Eyecons into it while utilizing Blaster Mode. This Eyecon temporarily possesses a businessman from the Satellite Development Center named Sachinoshin Tamura (田村 薩之進 Tamura Sachinoshin). A kind-hearted man, Ryoma likes helping others achieve their dreams and gives Takeru the approval to use his power when he helps Sachinoshin reconcile with his father. When summoned via the Eyecon Driver G, he can wield the Gan Gun Saber in Blade Mode. In his original human body, Ryoma is portrayed by Taihei Katō (加藤 泰平 Katō Taihei) of TV Asahi announcer.
- Ryoma Damashii (Ore Base) (リョウマ魂（オレベース) Ryōma Damashii (Ore Bēsu)) is a devolved version of Ryoma Damashii using the Ore Transient. This form's Omega Drive charges energy into the barrel of the Sunglasseslasher in Blaster Mode before Ghost shoots the enemy with it.
- Himiko Damashii (ヒミコ魂) empowers Ghost with the spirit of the Japanese shaman queen where he gains mystical-like abilities. In this form, he wields the Sunglasseslasher in Sword Mode which can also double as a magic wand for him to cast spells with. This form's Omega Drive traps the enemy within a tornado for Ghost to unleash an energized slash. This Eyecon temporarily possesses an assistant president from the Himiko Research Association named Miwako Hino (日野 美和子 Hino Miwako). Himiko's supernatural believes put her at odds with the logical-minded Newton until the latter considers Takeru, allowing the two to cooperate. When summoned via the Eyecon Driver G, she can wield the Gan Gun Saber in Naginata Mode. In her original human body, Himiko is portrayed by Yuka Hirata (平田 裕香 Hirata Yuka).
- Himiko Damashii (Ore Base) (ヒミコ魂（オレベース) Himiko Damashii (Ore Bēsu)) is a devolved version of Himiko Damashii using the Ore Transient.
Takeru later obtains another, more powerful belt called the Eyecon Driver G (アイコンドライバーG Aikon Doraibā Jī), which allows him to transform into Grateful Damashii (グレイトフル魂 Gureitofuru Damashii). In this form, Ghost is able to utilize the powers of all 15 heroic Eyecons by summoning their Hoodie Ghosts to fight enemies alongside him in combat as well as when he performs the Omega Formation (オメガフォーメーション Omega Fōmēshon) finishing move. This form's Omega Drive has two variations for Ghost to use: a Rider Kick empowered by the 15 heroic Eyecon spirits or an energized attack with the Gan Gun Saber and Sunglasseslasher. Grateful Damashii's ultimate attack is the Mega Omega Formation (メガオメガフォーメーション Mega Omega Fōmēshon) where Ghost summons all 15 Hoodie Ghosts to join him in performing a Rider Kick. The Eyecon Driver G was created by Edith for the Gamma emperor Adonis, and later Adel, to harness the powers of the 15 Gammisers until Takeru takes it while reclaiming his stolen Eyecons. However, if Takeru transforms into Grateful Damashii with this belt while the Gammisers are activated under Adel's command, he will get electrocuted and be temporarily paralyzed, which even lasts several minutes after the transformation has been deactivated. It is later revealed that if any of the heroic Eyecon spirits are not willing to give Takeru their full cooperation with him, Ghost will be unable to completely utilize Grateful Damashii's powers. Due to the existence of Mugen Damashii, the heroic Eyecon spirits started to believe that Takeru no longer needed them, which affected their fighting skills when Ghost Grateful Damashii summoned an entire army of them against Adel and his Gammisers. However, during Takeru's battle with Gyro, they manage to regain their composure when he assures them all this wasn't the case by instead choosing to use their powers to help him defeat the Gamma Ultima. In the final battle against the Great Eyeser (a form of Great Eye possessed by Gammisers), Ghost can summon them without needing this form.
During a battle against a fusion of Gammisers Fire and Gravity, Takeru is killed when his Ore Eyecon gets destroyed by it. Before he was about to disappear into the afterlife, his seven friends (Akari, Makoto, Kanon, Onari, Alain, Shibuya, and Narita) infuse their emotional embodiments into each of the broken pieces of Takeru's Ore Eyecon, restoring it back to normal and reviving him once again. After his third revival, Takeru obtains the Mugen Eyecon which unlocks his full potential in stopping the Gammas' warring by transforming him into Mugen Damashii (ムゲン魂, Infinite Damashii). In this form, Ghost receives enhanced abilities which includes the power to manifest infinity-shaped wings for either flight or defensive purposes. He is also able to perform stronger emotion-based versions of the Gan Gun Saber's finishing moves. Mugen Damashii's ultimate attack is the God Omega Drive (ゴッドオメガドライブ Goddo Omega Doraibu) where Ghost empowers himself with rainbow-like energy to perform either a Rider Kick or a Rider Punch. Any finishing move used in this form allows Ghost to destroy a Gammiser permanently.
- Naginata Mode: Yorokobi Stream (ヨロコビストリーム Yorokobi Sutorīmu, Joy Stream)
- Arrow Mode: Tanoshii Strike (タノシーストライク Tanoshī Sutoraiku, Fun Strike)
- Rifle Mode: Shinnen Impact (シンネンインパクト Shinnen Inpakuto, Faith Impact)
- Gun Mode[f]: Isama Shoot (イサマシュート Isama Shūto, Valiant Shoot)
- Twin Sword Mode[g]: Ikari Slash (イカリスラッシュ Ikari Surasshu, Anger Slash)
- Blade Mode: Kanashimi Break (カナシミブレイク Kanashimi Bureiku, Sadness Break)
- Hammer Mode: Love Bomber (ラブボンバー Rabu Bonbā)