Post a character who often, always, hoặc almost always goes bởi his/her last name/surname

koichi sakakibara almost always goes bởi his last name,sakakibara...........

Zura! er... I mean Katsura X3 Kotarou Katsura, not once he was called bởi his first name in the anime, it's always Zura hoặc Katsura XD

i guess tetsuya kuroko always goes bởi the his last name kuroko

Kazahaya

Youhei Sunohara from CLANNAD. The only character who ever really addressed him as 'Youhei' was Kyou Fujibayashi, and he had not granted her permission hoặc clarified that he felt comfortable with that.