He is the youngest of the group. He is also the computer wiz of the four. He often provides the group with technical equipments and such. Other than that he is also skilled in using his crossbow/darts. He is a sharp shooter. Despite his lack of physical endurance, he supports the group with information and as a sniper. Omi is the most cheerful among the four. He is kind with people and likes cheering them up.
Past:
He joined Weiss because he didn't know who he really was. He didn't know his true identity. He learned eventually that he was kidnapped when he was a little boy. His father Reiji Takatori didn't want to pay the ransom so he was about to be killed by the kidnappers. Persia came and rescued him. He didn't really remember much because of the trauma he lost his memory. When he found out he doubted whether who's side is he on, he nearly shot Aya and Ken to let his brother escape (Aya hated Takatori's clan a lot). Omi's real father was actually Persia, Reiji's wife really loved Persia and Omi was the result. Persia didn't know he was his child till he died and he never got to tell him either in the end.