Takeshi is a cocky, somewhat arrogant, yet laid back, determined racer who lets his fame get to his head. His other teammates (especially Liz) normally berate him for such things. However he is able to keep a clear head by playing a video games. As the series progresses he "grows up" and becomes more mature. He has a normal family life and he has a crush on Liz (who feels the same way).
Liz is very annoyed with Takeshi for his brash attitude and while Takeshi has a grudging respect for Liz, he also doesn't seem to be able to take her seriously most of the time. Takeshi often thought of Liz as his friendly rival She scolded him for not being "honest" about his feelings for her. Near the end of the series they confess their love for each other.
River has a strong dislike for Takeshi early on, due mostly to the fact that he doesn't get to race. He often get in Takeshi's face and (like Liz) scolds him for his attitude. River one day wishes to properly race Takeshi, so he left Team Satomi to race him in a friendly rivalry.