I changed my avatar on some sites to a strange villainess. That would be Limstella, the second-to-last boss of Fire Emblem  for the GBA.
To be honest, although I played the game as a child and loved loved loved it, at the time I only saw her as one boss among many. Now, I’ve grown to like her more. I think it’s the character design applied in greater detail by both official and fan artists giving her the semi-androgynous, creepy look with more justice than a 16 bit portrait.
As a deliberately almost emotionless drone, she doesn’t match her “sister” Sonia in terms of pure evil. What separates her from being just another speedbump is her death quote:
“I am not human. This body and this heart are constructs. Yes, as is this sorrow.”
Whether that’s a “why was I programmed to feel pain” quote, or an instance that there was something there that wasn’t in a mindless morph like Denning is up to the audience, and gives her (possibly unwarranted) attention. Still, she works as a minor villainess. (I even had a “Rosetta Stone” for a weird conlang by translating her name as “Starlight” in whatever language she was named in)