Anti-Villains are somewhat the opposite of Anti-Heroes. While the Anti-Hero often fights on the side of good, but with questionable or selfish motives and methods; the Anti-Villain plays a villain’s game, but for a noble cause, or with respectable qualities, in a way that the audience or other characters can sympathize with. They may be more noble or heroic than an Anti-Hero, but the means to achieve their ends are often considered exploitative, immoral, unjust, or just evil.

https://villains.fandom.com/wiki/Category:Anti-Villains

So characters like Magneto or Poison Ivy