I love when there are canonical alternative versions of the same character. The whiplash it gives is pretty fun.
Like in Melty Blood with the main antagonist being TATARI, or Night of Wallachia, a psychotic vampire that is also a living sentient event, that want to capture and torture his daughter Sion to be the next TATARI. But in Fate timeline, he's a kind and caring father to Sion, albeit he's extremely sus.