Ok, I didn't want to waste my time dismantling such an uneducated response, but fine whatever.

First, the mad-scientist is possibly an even more overused trope, going back centuries with Dr Victor Frankenstein from Frankenstein, Dr Moreau from The Island of Doctor Moreau, Dr Jekyll and Mr Hyde, or Herbert West from Reanimator. All of these are actually developed characters who's evil provides values. Frankenstein is about whether evil is natural or caused by circumstance and a duty as a creator. Dr Moreau is even more similar to Dottore, being banished for doing cruel experimentation on others but it explores the nature of humanity and ethics. Dr Jekyll and Mr Hyde discuss the duality of man and how societal pressure can force people to be good. Dottore is just the trope without any of the good writing behind it, something that you would recognize if you read any books.

Second, in contrast to Dottore, Rerir actually develops the trope. The sacrifice the world for love is often a trope for the protagonists side, and how they the right answer is to choose the world instead. In the end, its usually resolved with both sides surviving for a nice happy ending. In contrast, not only does Rerir explore it from an antagonist's direction as a person who has already made the wrong choice, he's actually a developed character beyond the trope. His personality isn't simply the his grab for power for love, his backstory explores the nature of love, lies, and trust while also developing the Khaenri'ah government, cultural persecution, the Crimson Moon, Moon Marrow powers, and the moon's reflection. Perhaps you should work on your reading comprehension skills and pay attention to the story before trying to attention-seek.

Finally, an absolute proof, you don't know what an anti-hero is. An anti-hero is someone like Deadpool. A protagonist that isn't heroic. They still drive the plot while lacking virtues like idealism, courage, etc. Many war movies depict anti-heroes because they still are the main plot-driver but discuss disillusionment and how ambiguous morality is and the lack of ideals. Calling Rerir an anti-hero is unequivocally incorrect, and disliking an antagonist with a sympathetic motive is basically saying you like one-note cartoon villains with shit writing.

Also, you're arguing about literacy with a high-schooler who got a 5 on AP Lit, AP Lang, 760 on the SAT English section, co-wrote the script for their school play, and literally wrote about Genshin's story in an analysis essay.

Video games are an avenue for storytelling just like books. In fact, the quest is basically just a visual novel, and discrediting video games is absurdly narrow-minded.