Victor_Weismann
Most likely Leon's power will be related to seduction or something like that... I have a feeling he will end his relationship with Anna once he wakes up. He clearly wants a Harem, or other women, and has some dreams of grandeur.. (Let's hope he doesn't want to be some King, cause his dreams will be shattered.) He also showed envy and jealousy towards his son, so he might go after his women...Luckily all are stronger than him. I can't wait to see how Leon will turn out, i'm not expecting anything good though, because so far the clues given to his repressed desires haven't been too nice.
After seeing how Leon acted. Anna should just tell Victor that she knows what her true desires are since she thinks a lot about it and that he should actually "bite her" because that's what the inner desires are about. Anna should also say that she is splitting with Leon to help motivate Victor to bite her. She wants him really bad on the inside and she needs to come clean about it. Especially since turning into a vampire will awaken the ultimate form of that desire.
If they break up over this transformation I think it would be mutual. Anna would go after Victor with those desires she keeps thinking about and Leon will get his own harem. The split would be mutual and no one gets hurt. The fact that he considers Victor as a different type of person could help with seeing Anna going after Victor. He could see Anna as a different person as well and only support Victor on the side. Maybe the Harem he creates would have political benefits for Victor.
When Leon gets his Harem. It needs to be a harem that is absolutely loyal and has absolute love towards Leon that doesn't go after Victor. This Harem needs to help Leon support Victor in both a political and military power way. Through the special families that he claims authority over. Whether they are a small noble family, or a decent size, or regular vampire women. Leon needs to be guided and protected by Victor as he claims his own Harem for himself. Also! None of us want him to go after Vic's Harem!!!! He needs to be the ultimate vampire wingman for the Alucard Family.
Anna should just tell Victor to change her into a Vampire through the vampire marriage ritual after revealing her true desires. Desires that will run crazy if she doesn't have that mental connection with him like his other Vampire Wives. She might even kill Leon if she doesn't have that mental connection as a Yandere. The ritual should happen after Leon wakes up and they officially split. His desires will definitely make him leave her to create his own harem. With Victor's guidance and protection of course. After he leaves the room then they should do the ritual. Anna will definitely "attack Victor" and demand that he takes her to the bedroom for "private" "mother and son" talk that will definitely take many many many more hours to "talk." Especially if we can read "exactly" what they are "saying" and "doing" in "great detail"!
Honestly, some random theory popped into my head when i read that him and his father are nothing alike. With Victor being loved by the lightning spirits and Zeus' habits and prophecy... what if Zeus took Leon's form and slept with Anna?... Somehow i can't help but think that this is the case.. wouldn't that fit in a weird way with all the clues dropped ?
wait Anna is yandere for leon so it shows that if she becomes full yandere then mostly she will focus on Leon for it and Victor bc he her son or it shifts to Vic and Leon leaves on a adventure maybe get his own hearm but if it was up to me I want Leon and Anna to just feel stronger about there selfs and there love grows to a new lvl and they grow stronger together