tough fight between zhongchi and xiaoven but I'll probably go with zhongchi. why?

A man that does not believe himself to be anything but a weapon, actually partially insane from falling into the literal allegory of hell as a kid. Power hungry, clever, bloodthirsty, determined and killed more ppl than you could count - and yet he is full of life, values family and is insanely generous towards ppl he trusts. A walking enigma that is hard to understand even for Zhongli who knows otherwise literally everything about the world he partially created. It's a fighter Zhongli can respect and person that is interesting to get to know, someone that helps him look forward to the gnosis-less future instead of letting Zhongli loose himself in the merciless memories of the past.

Zhongli is a god too tired to hold onto his title, who took too many lives and lost too many people himself. He is, also, one of the few people that can accept Childe as he is, wholly, including all the killing and the insanity of the Abyss. No matter what atrocities Childe will commit during his mortal life, his hands will never be bloodier than those of a war god.

It's the notion of two people who'd be deemed irredeemable by others for what they had to do in their lives to survive, who perhaps cannot fully accept themselves; them finding each other and along with it, finally finding understanding and a safe space.

a little therapy of the realisation of no, you are not alone and no, you are not unlovable.

idk bro i just like troubled ppl getting their happy endings

also childe has a thing for people that can kick his ass, childe being Tsaritsa's subject = conflict of faith, the tragedy of a god falling in love with a mortal... this dynamic just keeps on giving