>>30679>Bleach ever had anything to fuel weight gain besides Orihime's appetite?Do you know anything about the series at all? Hollows literally have insatiable appetites that drive them to consume. Ones too weak to leave Hueco Mundo hunt each other or subsist on passive energy and suffer, ones strong enough to leave hunt humans, and the really powerful ones only hunt other powerful Hollows or Shinigami, because those are the only things with enough energy to satisfy their hunger.
Not only could you justify weight gain and vore with literally any of the female Hollow characters, you could do it with anyone who has Hollow powers as well. You could also easily make some claim that Hollows can carry a spiritual disease that inflicts hunger on Shinigami and humans that catch it, since they're just hungry ghosts as a trope. Or that certain spiritual wounds dealt by Hollows inflict that. Or even that the Hollowfication process Ichigo had to undergo, which is technically a lethal condition, has a cure that stops it but gives you a Hollow's endless hunger. Which means it could be inflicted on anyone.
Or if you don't like the Hollow angle, it's outright shown from the start of the Soul Society arc that the guys responsible for creating Gigai are creepy and that they sexualize it. Do you really think "recreational gigai" don't exist? Or that the Shinigami don't use them? It would be pretty easy to imagine they do. It's not like they have anything else to entertain themselves with in their weirdo concrete commieblock Edo period heaven.
Or hell, you could just say that eating regains energy, and anyone hurt badly enough is bound to end up eating their own body weight in food, or more, while they're recovering.
Try and be the slightest bit creative.