I saw your fusion AU post and need details (if you’d oblige me). Because this is steven universe inspired, do they dance to fuse? Do they do a gay little dance on the battlefield? This is important information. Also, fusion appearance: do they just look like giant ppl or are they big ol’ abominations? I garner it would vary case by case, but if you have an appearance in mind for [insert fusion name here] know that I’m looking expectantly 👁️👁️ (1/2)
Asdfghjkl okay so some of this i have written down places already but some of it is only in my brain, and because i am not musically or visually creative some of it never occurred to me, so bear with me.
In this AU Force-wielders—most existing within the Jedi Order and therefore pretty much all assumed to be Jedi, colloquially known as gems or crystals depending on location—are like SU Gems in that they're beings made of light and the Force whose sentience is contained in kyber crystals from which they project their mobile physical forms. When projecting a physical form, their kyber cores are contained within them like SU gems, except when they move into their "weapon forms" aka lightsabers. Since I'm not inclined towards music or dance, and because Steven proves that you can fuse with a gem who's retreated into their gemstones to reform, dancing isn't required to fuse but I think it's probably a cultural and ceremonial things for Jedi proper. And fusion works with non-gems because something something through all things the Force flows.
You're right that fusion appearances vary case by case. Everyone's base appearance is the same as in canon, and while fusions can get very big depending on how many are fused and how stable the fusion is (less stable fusions being bigger) they usually stay under about 8 feet i think.
Fusion appearances are vague because, again, very much not an artist, but I do have a few specifics for some of them: Anyone who fuses with Ahsoka has togruta montrals, anyone who fuses with Maul has zabrak horns plus an extra mouth, anyone who fuses with Anakin has four arms, and anyone who fuses with Rex has four eyes.
Maulakin: keeps Anakin's hair so the horns end up looking almost like a half-hidden crown, and they also have Maul's markings but subtler almost like they're showing from underneath Anakin's regular skin.
Rexakin: most normal-human-looking, dark golden curly hair, one pair of brown eyes above a pair of yellow eyes, deep tan/light brown skin? Only one mouth but voice is slightly double-toned and they talk more like Anakin but move more like Rex.
Maulsoka: from discord dms, "I'm thinking Maulsoka probably looks the most "monstrous" of the bunch: zabrak horns and togruta horns, four eyes, four arms, white markings and black skin with a slick-looking red tint that looks like fresh blood on obsidian, and they're like 7 feet tall."
The list of most to least stable fusions, pasted below from the other post, ranges from about 6'5" to about 7'2" (which doesn't even surpass regular human heights let alone aliens but I think any bigger would just be a little too comical so no building-sized fusions like in the cartoon): Anasoka - Obikin - Obirex - Rexsoka - Rexakin - Maulakin - Obisoka - Maulsoka - Maulrex
As for the fusion lightsabers, I think there's quite a wide variation as well. A Maul fusion will nearly always use a lightstaff and an Ahsoka fusion will nearly always use Jar'Kai, but with the colors yeah probably gradients or maybe a thin core color/ greater outer color. Maulakin would use a lightstaff with a red core but mostly Anakin's blue. Maulsoka would probably also use a lightstaff but one end would be green and the other would be the yellow-green of her shoto, but maybe they would Ahsoka's Jar'Kai with a deep red saber and a much paler red shoto. Much fun to be had there, but as with the character designs, if I was an artist, I'd already have already tried drawing them instead of trying to talk my way through them lol.
Lastly, not one of your questions but because I don't think I've mentioned anywhere else: Maul and Anakin still use prostheses because the fights on Naboo and Geonosis were so traumatic that their projected physical forms were permanently changed, like Pink Pearl's cracked eye in SU.
Aaaaand I think that's everything! Thanks for sending these in btw it was fun to write some of this out even though I'm sure my lack of visual artistic skills is disappointing lmao