Are there any notable examples of heroic demons in comic books?

Yes, there are! Hellboy is the most prominent example. Beyond him, some characters exist with complex morality and often act as anti-heroes, battling other demonic forces or striving for a greater good, even if their methods are unconventional. These characters challenge the traditional demon archetype and demonstrate that not all demons are inherently evil. Their stories explore themes of redemption, self-acceptance, and the blurring lines between good and evil.