Here in these scenes, Hiro is using the same words while he's a superhero, that tadashi said to him. Hiro thought those were things a good superhero would say to others. Which means that Hiro saw Tadashi as a true hero.
Hiro Hamada - instant cosplay by Kishkka on deviantART - this is literally THE BEST Hiro Hamada cosplay I have EVER seen! (When my brother saw this, he just kinda paused, then said, "Is that a real person?" xD) I want to marry this person!