My Hero Academia's creator, Kohei Horikoshi, is a fan of star wars. I thought that maybe the burn on Todoroki's left eye could also be a tribute to star wars. I didn't consider Avatar the last airbender because I haven't watched it. Sorry
KOHEI HORIKOSHI WAS A BIG FAN OF STAR WARS... THIS TEMPLATE THAT YOU SEE HERE IS A STAR WARS TEMPLATE FROM THE SCENE WHERE DARTH VADER TELLS LUKE THAT HE IS HIS FATHER... I FOUND SOMETHING AMAZING; THERE'S A BURN ON HIS LEFT EYE... AND YOU KNOW WHAT THAT MEANS...