“So this person is a bad guy?” “I’ll cause you trouble.”
Yusei has an absolute heart of gold, he is the nicest person and he really looks after the twins. He is very parental with them! He fixes their duel disks when they were too big, he was immediatly there to catch Lua after his duel. He hugs the twins before his duel with zone and assures them he won’t die. Lua and Luca are his honorary children.