Complete Monster/Beyblade


 * Beyblade has few:
 * Doji from Metal Fight Beyblade. He is a cruel, sadistic man who doesn't care about anyone in the Dark Nebula except Ryuga and takes pleasure in feeding people to L-Drago, and he does it to Dark Nebula bladers who lose a match and fail him or when they are no longer useful. He also recruits bladers against their will into the Dark Nebula and we see that all bladers who fail him are kept as prisoners in his headquarters. He makes no effort to hide how evil he is, openly mocking and laughing at his enemies as he enjoys their suffering. Ryuga has excuse of, but Doji is pure evil all on his own. It's satisfying to see him.
 * From the same series, we also have Reiji Mizuchi. He's a cold sadist who relishes the suffering of his enemies. Aside from Ryuga and Doji, he is only person who enjoys being in Dark Nebula. He destroys his opponents' Beyblades For the Evulz, even if they've already surrendered to him. His entire fighting style revolves around striking fear into his enemies, which he loves doing. And winning isn't his goal, breaking his opponent is. Even when he's already won, he has a habit of keeping the battle going just to cause his opponents even more pain and humiliation, all the while laughing his head off at their suffering! If it's any sign of his character, he named his Beyblade's finishing move "Poison Genocide" - that should tell you something about his personality. He embodies Teens Are Monsters and is one creepy scum who deserved . He is sometimes considered to be worse than Ryuga due to his cold sadism.
 * L-Drago itself qualifies. In Metal Fight Beyblade, we find out that . Also, L-Drago feeds on energy from other Beyblades and human energy and it's power  . He is the only Beyblade who is pure evil.