A-ah, that's not... really it! I mean...it took me three years to call Mei-san by her first name. [And yet the extremely polite honorific is still tacked on even after all that time.]

I'm just not used to it. [Nervous and flustered, Izuku gives into the urge to babble, as he usually does.] But like you said it's your hero name, too. If you really want me to call you by your given name, I mean, hero name instead, I can try my best...