Post a character who often, always, या almost always goes द्वारा his/her last name/surname

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

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

i guess tetsuya kuroko always goes द्वारा 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 या clarified that he felt comfortable with that.