Pirate King Luffy is obviously not cringe. Wanji is interchangeable among the fans so I don't see why people would think it's cringe since there are people who uses the term like "L.anji" and "C.andy" etc. Grandmaster Zoro is definitely funny and creative, but I don't know the context of it. Like, who was the first one to come up with it?
So I didn't vote for any of them. The cringe terms however are usually the ones that other users used for insult and mocking other characters and fans, like c.andies, c.ondoms, sword swallowers, etc.