List of Monster Allergy Characters - Antagonists - Major Antagonist - Hector Sinistro

Hector Sinistro is a Dark Tamer, and one of the main antagonists in the second season of the Animated series. He literally has two left hands since his right hand is also a left hand. He tries to get his revenge from Zob attacking his son by tampering with his teleskates, shrinking him with Mr. Uzka's shrink ray and putting him in a snow globe along with other monsters to attack Zick. He vows to get his revenge when he was outsmarted and defeated by Zick. He then kidnaps some monsters in Bibbur-Si to perform in his circus. Zick, Elena and Bombo manage to track down and stop his plans, but was able to escape them. He also seen controlling Bombo to make him wrestle as the Almighty King and acted as his manager to make a lot of money, but his plans were ruined by Zick and Elena again. In the past, he was a respected tamer until he was discovered by Zob who saw him selling illegal captured monster to the highest bidder to the Anguanes. He was turned in by Zob, and had been marked as a renegade Tamer or Dark Tamer and was banished form the Armory. He plans to obtain his treasure by creating a shadow army to attack the armory and stole Zick's shadow to lead him to the crypt to where his captured monsters were. However, his plan was foiled by Elena and Zick's Grandparents, Theo and Tessa. They destroy his cane to free the shadow along with Zick's shadow. He manages to escape the Tamers, and left him since he's no longer a threat without his cane. He was seen with a new cane by having a Megarock burrow his way to attack the Armory form underneath to claim items that were confiscated. However, his plan was foiled again by Zick and Elena by saving the baby Megarock, and defeated again by Zick by being imprison in a cave with fallen stalactite. He was brought by Emily to the Moog Magister to help him get to the Ancient Armory by going to the Hundred and First Door and agrees to help Moog to get Domboxes in the Crypt and he can get the Scepter Dom. He then suddenly betray Moog after he tells him that the lava was rising when they open the Hundred and First Door. He uses Bombo to escape and the rest other monster to attack the tamers whilke trying to escape the Armory. However, as he uses the Scepter Dom too much he was turn into a small monsters that made him weak as side effect, and he ended up becoming Bombolo's pet.

In the Comic Book Series, Hectro is 783 human years. This Tamer was imprisoned for life for his crimes against monsters. Hectro was labeled as the freak in his childhood because he was born with two left hands but was not left-handed. He is sinister by nature, turning his passion for the circus into a nightmare. Sinistro represents one of the darkest moments of the history of Tamers. He was captured by Ezeria Zick but later escaped through cracks in his Dom Box, which, because of his passion for the circus, was in a pattern of a carnival. After his escape, he kidnapped Bombo and the other monsters to show in his horrible circus. Bombo alone, because of his stomach, was forced to give up his invisibility and fight in a wrestling ring as the Great Chumbo, swallowing his opponents and spitting them out. This was a great hit for Hectro as Bombo made him a lot of money. Zick and Elena came to rescue Bombo, breaking the other monsters out of prison. They tried to stop Hectro but he had escaped. Hectro was seen again in where he has gathered some Dark Tamers to attack the Ancient Armory, and manage to kidnap Elena and forced Zick to give up all his Dom power in order to save her, but Dom energy that was kept in the Dombox was too much to contain and exploded, killing him along with other Dark Tamers.