Character creators like Roblox and solcalibur 6(idk about gacha I’ve never touched that) are literally just taking things that already exist and arranging them in a new order to make something new. Not sure it’s possible for the creator of the maker to try every single combination, at least for Roblox and Soulcalibur. In Soulcalibur, there are multiple races, faces, hats, colors, clothes, patterns for said clothes and hats, voices, weapon customizations, extras to add literally anywhere on your character etc etc, so it seems a bit goofy to say that they’ve tried every combination. Also it seems your main point is it can’t be an oc, it’s just a character you made, but isn’t a character you made an oc??