* Voiced by: Takuma Terashima
* Age: 17
* Personal Song: "BANG×BANG"

Tōma is one of the  idols introduced in [i][[idolmaster_2|The iDOLM@STER 2]][/i]. The leader of "Jupiter", he is a year younger than [[shijou takane|Takane]]. His hobbies are soccer, cooking, and figure collecting. His character image songs, which are shared with the other two members of Jupiter, are "Alice or Guilty" and "Koi o Hajimeyou". In the anime, he slightly admires [[kisaragi chihaya|Chihaya]]'s recovery from the exposure and her singing during Idol Jam. The Idolmaster 2 hints at a potential relationship between him and [[amami haruka|Haruka]].

He and his group are signed onto 315 productions in [i][[idolmaster_side-m|iDOLM@STER Side-M]][/i], becoming one of two main idol groups for the company (the second being [[dramatic stars (idolmaster)| Dramatic Stars]]).
天ヶ瀬冬馬