Can't think as have not been following shounen much(definitely not anyone from one piece that's for sure).
I want to specially mention that Isaburo from Gintama won't go too deep to avoid spoilers but damn I remember how I felt about his whole character.
1. There is HxH(Mereum and others, Kurapika, Gon, Killua...damn there are many even with less time..new characters are also so good)...
2. Eren I guess...