@DeskCoffeeyes, it could be genetic, or based on exp points and genetic, or how long your lineage is, or completely random. 😃 But thanks to your research, the one thing we do know is that it is not based on Aspiration or Personality traits! 😉 The info about Wolf Quest is interesting, and might shed some light, so we will have to see!
The only other thing I can think of is it might have something to do with whether your Vampire was created in CAS or got turned in-game, but that seems like a long shot.🤔
I'm sorry your master Vamp family got deleted! 😢 And I bet you will be paying attention from now on! 😇
Update: I tested 3 different Vampire families (2 with 3 members and 1 with 2 members), with a total of 8 Vampires tested. There wasn't a difference in the color of the bats between a Vampire made in CAS and a Vampire turned in-game. Also, while bat-color might still be genetic, it is not linked to the human form's hair, skin, or eye color. All of my 8 bats tested were the darker type. If the white bat color has anything to do with genetics, it is a recessive trait and probably randomly generated (as if it were a mutation.) 🤨 Also, all bats had aqua-blue glowing eyes, like the one in your picture. 😉
Again, if I find anything about different color bats and what causes them, or if I see a different color bat, I will tell you! 🙂