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A student at Yokobane High School. Together with Rei, he had hired Hamatora to find their missing teacher, Yasuo Kitazawa. Later, he and Rei took part time jobs at a hot spring, where they once again crossed paths with the Hamatora.
Background
Theo was bullied in an arcade a month before the current storyline by five high school boys. This lead him to the thought of jumping off the school's roof multiple times after the event. He even decided to tell his parents and teachers about his problem but they all threatened him saying that if he told anyone else, they'd go to Rei and mess her up ( This showed that he cared for her ). However, his teacher, Yasuo Kitazawa, took the problem to the school board and ended the problem. According to Theo, Kitazawa-Sensei was "the only light in his darkness".
Personality
Theo is a very hot headed individual as shown by him getting angry at the slightest thing. He has shown open attraction to males, meaning he is gay. He had shown past affection for Kitazawa (before seeing his true colors) and he had a temporray crush on Hasuda Arai (before learning he was a criminal). This also shows he has bad taste in men, and tends to prefer older mature ones.
Relationships
Rei
The two are very close, and Rei is almost always seen by his side or somewhere else nearby. They share a relationship akin to childhood friends or siblings.
Yasuo Kitazawa
Kitazawa was Theo's teacher at school, and such is viewed with a lot of respect. Theo admires him for both his work ethic and his compassion for others, and is very grateful for the help he contributed when stopping the bullies. The two were close, as shown by Theo's reaction to his death. However, Theo begins to feel remorse for his teacher when he finds out that he was the ring-leader behind the bullying, and thus becomes angry and depressed. He is shown destroying an arrangement set to honour Kitazawa's death in a fit of rage.
It is hinted that Theo held romantic feelings for Kitazawa.