A few amusing thoughts
Marius' big scar reminded me of Viktor's diagonal face slice. I thought he might have been Viktor revived and turned by the Lycans, using Michael's blood to survive.
Thomas was also very similar to Viktor
Alexia might have been Selene's daughter - lost and found by the coven and raised as a death dealer
Marius might even have been Michael, trans mutated by the lycans - and brainwashed to boot