Tatsuma Ushiyama

牛山辰馬

aka Ushiyama the Undefeated (不敗の牛山), Professor Penis (チンポ先生), Obencho (オベンチョ)

One of the Abashiri Convicts. Ushiyama is a pragmatic and serious criminal. Aiming to steal the Ainu gold, Ushiyama is focused on his mission and always threads with prudence, regularly offering reasonable advice to [Hijikata](https://anilist.co/character/125422/Hijikata-Toshizou). He is also a womanizer. Ushiyama lusts after any beautiful woman he comes across and is very direct when he solicits sex. It is his main way of distracting himself. He claims that in a relationship, a man's penis is the most important factor, but says that it has to be "gentlemanly". As a judoka, Ushiyama relishes fights and challenges. When he met [Sugimoto](https://anilist.co/character/124704/Sugimoto-Saichi), he was impressed favorably by his strength and befriended him. He likes to fight and had a great time clashing with Sugimoto, being disappointed when it was interrupted. Ushiyama is confident in his fighting prowess to the point he will challenge a (weakened) bear in combat and even briefly taunts it about spreading his legend among bears when he forces it to flee.