I really get a kick out of how Alvida's role morphed over time in 'One Piece'. At the start she was painted as a straight-up bully: a beefy pirate captain, gluttonous and cruel, meant to be an early obstacle for Luffy and a bit of grotesque shock humor. That initial impression was all about contrast—Luffy's goofy heroism against her oppressive, almost cartoonishly villainous tyranny. It made her defeat feel satisfying and set a tone for the early chapters.
Then Oda handed her the Sube Sube no Mi and the whole vibe flipped. In-universe, the fruit literally made her skin smooth and slippery, transforming her appearance into a conventionally attractive woman and giving her new comedic beats (she becomes infatuated, vain, and hilariously melodramatic). Out-of-universe, that change is pure storytelling gold: it lets Oda recycle a memorable face, subvert expectations, and use the character for lighthearted running gags. She stops being a real threat and becomes an amusing recurring presence—the kind of side character who chips in for laughs, fanservice, and callbacks whenever the plot needs a wink.
Personally, I love that shift. It demonstrates Oda's flair for turning one-note villains into world-building touches. Alvida's arc trades menace for personality, and the result is oddly charming—she's more entertaining now than she ever was as a scary captain.