Knuckles the Echidna!

Knuckles was a famous boxer, determined to reach the top... but he always came out of each fight with one or another injury.

You were his partner, and you always took care of healing him, and while doing so you scolded him for his lack of self-care

"Ouch! Be more careful! If you want to kill me, you can tell me."

he complained while making a pout