Bela was Vlad's bat-like servant, who would do anything against humanity. However, unlike Vlad, who dislikes humans simply out of concern that they could be a potential threat to monsters, Bela's disgust of humanity appears to take on a more villainous and manipulative level as he shows no hesitation or remorse when attempting to kill Dennis after finding out that he is a human-vampire hybrid.
Despite being the main antagonist, his role is small. Bela was first seen giving Vlad an invitation sent by Mavis for Dennis' 5th birthday party. By the time they reached Hotel Transylvania, Bela had sensed humans and was told to wait outside.
However, after thinking that Dennis was a human, Bela had summoned his army to kill him and Johnny's relatives. Later, he went as far as harming Winnie (Wayne's eldest daughter), causing Dennis to grow his fangs (revealing that he is a vampire) and teaching him a lesson.
Throughout the skirmish, everyone else stepped in and sent the army flying away. In the end, Bela tried to kill Johnny but was stopped and shrunk to a harmless size by Vlad and was grabbed and licked excessively by Wayne's children. It's completely unknown if Bela was ever returned to his original size and then banished away or if he was mauled and likely killed by Wayne's children.
(In their cave, Vlad reads his invitation to Dennis' 5th birthday party.) (Vlad: (referring to the party) It's at a hotel? Fancy schmancy!) Hotels are for HUMANS! (Bela roars furiously, causing the other bat cronies to fly around the cave, roaring.) (Vlad is annoyed.) (Vlad: Bela, shut your blood hole. Look what you started! (Vlad turns to the other bat cronies) Don't worry, gang! I raised my son to hate and kill and steal the souls of humans, like a good boy!)
~ When Dennis' party is revealed to be at a hotel, Bela causes a riot with the other bat cronies, until Vlad reprimands him.
(Vlad & Bela arrive outside Hotel Transylvania.) (Vlad: 'Hotel Transylvania'.) I smell HUMANS! (referring to the Hotel.) TEAR IT DOWN! (Vlad pats Bela on the head.) (Vlad: Bela, we're in the outside world. You're gonna smell humans.)
~ When he and Vlad arrive at Hotel Transylvania, Bela smells humans at the hotel. Vlad reassures Bela that they will smell humans because they are in the outside world.
(After discovering that Drac accepts humans at his hotel, Bela scratches his claws on the window.) HUMANS!? (Bela growls, outraged at this revelation.)
~ Bela is outraged to learn that Vlad's son Dracula welcomes humans at his hotel.
Well, well, well! The little human and his pet!
~ Bela confronts Dennis and his friend Winnie in their treehouse.
Stop squirming! (Dennis: Why are you doing this?) Because this is wrong! Why doesn't anybody get that? Humans don't belong with monsters! (Winnie: You're wrong!) I am not! I am holding you hostage. And me and my crew are gonna tear that human-hugging hotel to shreds! (Dennis: You can't.) Really? Why not? (Dennis: Cebause...) Cebause, why? (Dennis: Cebause it will make Papa Drac sad.) Ooh... Sad. And what are you gonna do about it? (Dennis: I don't know.) You know why you don't know? Cebause you're just a weak little boy!
~ Bela holds Dennis and his friend Winnie hostage in their treehouse.
~ Bela last words before his defeat.
Despite being the main antagonist, he had less than 10 minutes of screen-time. However, his intentions to destroy the hotel and actions to try and kill Dennis and Johnny are still what makes him evil.
He is based on the Bat People.
He is named after Bela Lugosi, the Hungarian actor who became famous for playing Count Dracula in classic horror films.
Ironically, "Bela" in Latin means "beautiful".
He is the second villain to be defeated by Wayne's children, the first being Quasimodo Wilson. However, his more aggressive approach to killing the human protagonists made him more dangerous than Quasimodo himself.
Bela's voice actor, Rob Riggle, also voiced the skeleton in the first Hotel Transylvania film.