Azula qualifies?
https://inconsistently-heinous.fandom.com/wiki/Azula
While she may not qualify as NPE due to being too tragic and sympathetic, I don't think her sympathy is strong enough to overshadow her detestable traits.
She wanted to burn down the Earth Kingdom.
When she was younger, she was already very cruel, bullying and bothering Zuko, mocking Iroh without showing any sympathy for LuTen's death.
She smiled sadistically as Ozai burned Zuko's face.
He mocked Sokka for Suki's imprisonment.
In an act of dishonor, Azula attempts to attack Katara despite having nothing to do with her duel with Zuko.
She coldly left behind one of her teammates, Chiyou.