Kaku and Deku both look up to the same Hero but for different reasons. I think Kaku just want's to be recognized as the best. And he hats how much Deku outshines him in a lot of areas. Since everyone seems to want to compare this to Naruto. It is easiest to say He is sort of like Sasuke as Naruto is to Deku. But he does not waiver from his feelings as a Hero. He want's to be a Hero bad attitude and all.