Post a character who often, always, または almost always goes によって his/her last name/surname

koichi sakakibara almost always goes によって his last name,sakakibara...........

Zura! er... I mean Katsura X3 Kotarou Katsura, not once he was called によって his first name in the anime, it's always Zura または Katsura XD

i guess tetsuya kuroko always goes によって 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 または clarified that he felt comfortable with that.