Welcome to bittersweet, my little tribute to Jonouchi Katsuya (Joey Wheeler) from Yu-Gi-Oh! Duel Monsters by Kazuki Takahashi.
Once a bully, now a friend who would fight to the death for those he cares about, I've always considered Jou to be a realistic character. He's someone I could easily imagine myself spending time with and integrating into my friend group. Jou has remained a favorite of mine since I was 14 (!) years old.