Eiji Tomari (泊 エイジ Tomari Eiji) appears in the film Kamen Rider Drive: Surprise Future. He is Shinnosuke and Kiriko's son, and in the year of 2035 he claims that Mr. Belt's AI has been destroyed by a corrupted chip Banno had secretly implanted in the belt. Before the future had become a post-apocalyptic dystopia, he had protected it as the second Kamen Rider Drive, using the Shift Car Next Special to transform into Type Next (タイプネクスト Taipu Nekusuto). However, the Eiji that Shinnosuke and the others meet in the present time is actually Roidmude 108 who "killed" Eiji in the future and assumed his form, and steals Drive Driver equipments by renaming himself as Kamen Rider Dark Drive before traveling to the past to personally cause the second Global Freeze. Unbeknownst to Roidmude 108, Krim Steinbelt had created mind link technology to upload his mind to any other equipment related to the Drive Driver system like the Tridoron Key. Eiji used this to upload his consciousness into the Shift Car Next Special, which is ultimately used by Shinnosuke to transform into Drive Type Special to destroy the evolved Paradox Roidmude. With both iterations of Roidmude 108 destroyed, the future is saved and Eiji will grow up in a world of peace. In 2018 during Drive Saga: Kamen Rider Mach, Eiji is seen as an infant.
Adult/Future Eiji Tomari is portrayed by Mackenyu (真剣佑 Makkenyū).