Rinna Sawagami (沢神 りんな Sawagami Rinna) is the Special Investigations Division's visiting electro-physicist and she is in charge of engineering. In her personal life, she is single, and has some anxiety about her situation, but her bright personality still brings up everyone's moods in the Special Investigations Division. She is revealed to know about Krim Steinbelt and Shinnosuke's actions as Kamen Rider Drive, and she is revealed to be the engineer behind most of Drive's arsenal. After the division is disbanded at the end of the series, Sawagami returns to academia and becomes an international expert in electro-physics. Some time in the future, she is awarded the Nobel Prize in Physics.
Rinna Sawagami is portrayed by Rei Yoshii (吉井 怜 Yoshii Rei).