As with all my headcanons these can be bent or flipped or discarded at any time depending on what dynamic I'm in the mood for... But here's what I've got!
Detailed explanations below 👇
Feeder: K.eralis is the only one that makes me go "this man loves to fatten his partners up and is 100% a lover of good food and drinks, but gets nothing out of overeating himself." He is perfect feeder material for so many reasons, don't even get me started he's SUCH a specific kind of service top. I have got to write some x.Bralis feederism because that dynamic is also something special oughhh. Um. Anyway.
Fat Admirer (self-lovable): also known as "into bigger bodies, might even consider themselves feeders, haven't quite realized (or accepted) that themself gaining weight is also an option". The H.ermits in this category can be loosely grouped together into:
"Feeder" in denial: B.dubs, G.em.
Oblivious: S.kizz, & to some extent R.en (he's also in denial a bit)
Would probably be extremely open to exploring this side of the kink, but they're far too stressed / tired/ busy to get into all that right now (for the love of god someone take care of them): T.ango, Joe.
Switch: could go either way depending on the scene, the partner, the mood... Or in W.els' case (sorry W.els*), i don't know enough about them orz.
*Stuffing in armor is a fascinating concept though, as is an enemies-to-stuffers dynamic with H.elsknight. Hmm...
Feedee, (love)handle with care: this one's for the internalized fatphobia havers (I.mpulse, G.rian), the stat-loving health nuts (X.isuma), the ones with an ego who need to be brat-tamed into accepting their own softer side (D.oc, also G.rian a bit), and F.alsesymmetry (jock-to-chub but also it's F.alse so like. Handle With Care is implied).
F.alse & R.en have a whole character arc to go through before they can belong to the next category, a.k.a:
Mutual stuffer/gainer: People who want to eat good and be in good company while they do it, or just bring their partners along for the ride. H.ypxb are here because of that thing I wrote ages ago about them having a cute date at the P.ixelpulse noodle shop, B.eef is here because he's like if K.eralis was hornier about food (and also. Bear.), J.evin's just happy to be here, and P.earl is in this category because she's waiting for G.em and also I think my mc skin and hers should kiss. and give each other belly rubs.
don't look at me 😳
Finally we have the Feeders! Pure gluttons who don't need the encouragement of a partner, they'll happily grow themselves solo for the love of the chub. Z.edaph is enthusiastic while J.oel is more of a tsundere about it, but both are firmly in this box; while M.umbo bounces between this category & being an oblivious-type Fat Admirer who himself is already fat (in which case C.onvex or P.earl or even a G.rian post-character development could help him figure it out).