Luffy, the protagonist of One Piece, is an incredibly powerful pirate who has gone from strength to strength over the years. Luffy is an exceptionally powerful figure right now, having become an Emperor of the Sea recently. However, he wasn't always on this level. As a kid, he was rather underwhelming and had to train relentlessly to even be comparable to his brothers. While growing up, Luffy had to strengthen himself quite a lot, and he managed this by developing many interesting abilities, thanks to his high battle IQ.