If you liked
One Piece
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...then you might like
Katekyou Hitman Reborn!
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Both of them are long shounen series with the major themes of growth, friendship, teamwork, and loyalty. The main characters seem to be immature and irresponsible at first, but when the right time comes, they turn out to be badass. While one of them aspires to be the pirate king and collects crew mates, the other heads toward being a leader in an infamous branch of the mafia and increases the size of his "family." As more episodes go by, the series and characters grow to become more mature and serious; the series start off kind of slow and overly immature, but once they get going they are both really interesting and rather addictive. Whatever you do, don't overlook these anime series because of the fillers or the characters in the beginning!