In the movie, Hiro trust's his brothers college friends to help him get in to the college. At the end Hiro gets accepted into the college and thanks his friends for the help.In " Big Hero 6" Bay-max helps hiro through a depression and hiro trusts bay-max to help him defeat the villains with his well trusted college friends. That were there for him since the beginning.
The friend I trust is Leo. Leo is always there for me and i can trust him with anything. Once I dropped twenty dollars on the floor and he picked