Hmmm i kinda like these two....
Alright. I'll go with Luffy. He's one of them, ya know? Like an unpredictable person whom seems cheerful and idiot, clueless in everything yet when stuff gets problematic, his reckless action someway or another can save the day, even without an intention to save anyone from the start. He's a weird rubber boy, wears sandals, attaches to his strawhat (his great treasure due to certain reasons), but to top them off; he's a badass captain.
Hidden talent of his is how he unconsciously turn any kind of people (including enemies, strangers) to be his allies, be it momentary or in long period, probably because they have a feeling of not wanting to leave him alone.