Berserk Button / One Piece

As each member of the Straw Hat Pirates has a lifelong ambition, disrespecting these dreams are the easiest way to piss them off.
  • Monkey D. Luffy:
    • Don't touch his Nice Hat (a memento from his idol).
    • Don't disrespect the title of Pirate King (it's okay if you lay honest claim to it; he'll see you as a Worthy Opponent instead).
    • Don't disrespect the Jolly Roger by stealing or defacing it.
    • Don't steal his food, especially when it's meat, his Trademark Favorite Food (he's a justifiable Big Eater).
  • Roronoa Zoro:
    • Do not disrespect his dream or the idea of fulfilling a promise (his ambition to be the best swordsman in the world is a promise he made in memory of Kuina).
    • Do not make light of Luffy's ambitions in his presence. He made a pledge to serve him and he intends to keep that pledge.
  • Nami:
    • Do not spend money without consulting Nami first. Do not steal anything from her, especially if she stole it first.
    • Crewmates acting stupid in front of her tend to make her pull out the Armor Piercing Punch.
  • Usopp:
    • The Lovable Coward who would rather run away than fight, even post-Time Skip. But if you insult Luffy in front of him, you're doomed; he may be the weakest of the Straw Hats, but he's still a One-Man Army when he needs to be, and like Zoro, he won't put up with insults to his captain. Mr. 4 and Miss Merry Christmas found this out the hard way, after hitting him with enough force to kill a normal human a thousand times over.
    • Mocking his father Yassop is a quick way to piss him off.
  • Sanji:
    • Sanji's biggest berserk button is when anyone wastes food, including using food to fight with. He and Old Man Zeff almost died of starvation when Sanji was a child, so this one's very understandable.
    • He won't stand for it if somebody insults his cooking.
    • His original wanted poster had an ugly composite sketch. Bringing it up was bound to draw Death Glares from him.
    • Do not bring up Kamabakka. Remembering his two years in "hell" are enough to ignite in rage and/or open up a king-sized can of kick-ass.
    • Don't say that Sanji is incapable of protecting anyone. Doing so is a one-way ticket to finding his boot planted in your face.
  • Tony Tony Chopper:
    • Do not make light of medicine, and don't be a doctor who's Only in It for the Money. Learning this from Dr. Hogback really pissed him off.
  • Nico Robin:
  • Franky:
    • Do not take his speedo or do anything to dent his macho image.
  • Brook:
    • Brook's afro is precious to him as it is the last defining feature he has that his old friend Laboon can recognize him by. So... Nobody Touches the Hair!
    • Do not make light of life, as Brook's is intimately aware of the fact he's living a second life.
    • Another one that's Played for Laughs: in One Piece Film: Strong World when man-eating ants ignore Brook because he was considered "leftovers", he angrily states it was "a bit inconsiderate" and proceeds to cut all the ants down. This Berserk Button is pushed again in Chapter 682, when the little dragon from Punk Hazard looked disappointed that Brook didn't have any meat on his bones. This actually serves as a minor plot point, as it reveals that Kinemon also hates dragons, but for a much darker reason. Unsurprisingly, however, when he comes across animals who have a taste for bones, he's not any happier.
As for everybody else...
  • Averted by Hatchan when Zoro cuts his hair. He... decides to forgive Zoro because it's only hair and it'll grow back.
  • Gekko Moria has two notable ones. First is his old crew of True Companions, who were massacred by Kaido; just thinking about it is enough to provoke a Villainous Breakdown. Almost as big of one is stating, or even just implying, that he's weak.
  • If anybody mocked Eustass "Captain" Kid's dreams about becoming the pirate king, he wouldn't hesitate to straight out kill them for that.
  • Bartolomeo, a character who first appeared in the Dressrosa arc, was introduced as a rude, Ax-Crazy Jerkass. It's bad enough if you provoke him at all, but he absolutely worships Luffy; say one bad word against him in this fanboy's hearing, and it will be the last thing you ever say.
  • Kelly Funk from the Dressrosa arc, a boxer short in stature and temper with prodigious strength but no endurance at all. Call him shrimp or anything of the sort, and he'll pummel you within an inch of your life. As for the "no endurance" part that makes him less than a threat to those who are at least as strong as he, his Devil Fruit powers let him merge with his brother, a Gentle Giant with a ridiculously strong and sturdy body. When that happens, the threat level skyrockets.
  • Donquixote Doflamingo has two notable ones: people who would mock or insult his family in any way, and people who bear the name of D.
  • For the love of God, do not insult Donquixote "Corazon" Rocinante in front of Trafalgar Law. Ever. After Doflamingo spoke gleefully about what a waste of space Corazon was and how glad he was that he killed him, Law's response was to drag his body over to Doflamingo, despite being on death's door, and electrocute his liquefied insides.
  • Do not mistreat Trafalgar Law in the presence of Donquixote Rocinante. REALLY. DO. NOT. The first time doctors denied a terminally-ill Law treatment and humiliated him until he ran out of the office in tears, Rocinante became irate and pummeled the medical staff to a pulp, screamed about their faulty work ethic, and burned the practice down. Once World Government soldiers began being deployed to hunt the boy, he flew into rages and began attacking them too, disgusted and furious at their willingness to harm an innocent child.
    • Worth noting that he didn't do this once; Rocinante destroyed at least eight hospitals over the course of six months for making Law cry.
http://tvtropes.org/pmwiki/pmwiki.php/BerserkButton/OnePiece