Now all I'm thinking about is Norse AU!BKDK, in which Izuku is an average farm boy and Kacchan is a talented man who is also the successor of his mother's misunderstood magic.

Izuku gives him food, lodging, and falls helplessly in love.

Kacchan seeks nothing but respect despite being a man who performs Seidr, a form of magic that is deemed only fit for women. He wears the cat fur-lined clothing of his art in honor of Frejya, and will not hesitate to fight any man who treats him with disgust.

This meek green-haired man is the very first outside his own family to treat him with kindness and respect.

He is also the first to ever fight three men twice his size to defend his honor and reputation.

And win.

When he looked at it like that, falling in love with this reckless idiot was inevitable, really.