So, what I was thinking is, there should be a variation between the different types of symbionts, for example, there could be 3 of them and it would be a 1 in 3 chance for one of those types to spawn, I guess I can make some quick renders of the different variations. Obviously this isn't the final thing, I just made something really quick since I'm too lazy to texture it..

Do they have different abilities or are those just alternate models?

im not sure, its mostly up to crackers, but it would be cool if they had different abilities lol

He will probably give them different abilities because this is labeled game-changing.

I don't feel the symbiont should really have different variations, and I'm not sure what each variation could hold.