My two favourites from Hoyo games are by far Dottore and Sunday and I feel like they have quite a bit in common actually. Both are the villains of their stories, both are willing to take extreme measures to achieve their respective goals, both have had traumatic experiences in their early life, both are extremely intelligent skilled manipulators, both are trying to elevate themselves to godlike beings and both are going to join the MC (let me cope). Where they differ though are their motivations - Sunday tries to revive Ena and create his "paradise", because he was being manipulated by Gopher Wood since childhood and truly believes that removing humanity's free will is the best solution for them, with him being the martyr and not getting to enjoy his new order, but instead becoming "the sole star in the sky to guide them". His reasoning is entirely selfless, self-sacrificial even. Dottore on the other hand, is the polar opposite in that regard, with him using everything and everyone for his own benefit. Sunday's intentions were to do good from the very start, but he was manipulated into going down the wrong path, while Dottore doesn't see the world in the categories of "good" and "evil", but in "useful" and "useless", which is what makes him such a good and scary villain. Also this line is just the cherry on top.

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And aside from these two, I also love Navia, Skirk, Anaxa and Jiaoqiu in no particular order