Fagin

Fagin is a sinister black-feathered vulture as is the main villain from War of the Birds, a very obscure Danish animated film.

Fagin was extremely spiteful in life as he killed off the parents of the main heroes of the film, Olivia and Oliver. He also kept around a beautiful dove as a slave to do his evil bidding. Fagin was eventually killed in the final battle, and assumedly burned to death.

Role in the series
Despite his death, Fagin refused to die so easily, as he purposely flew into the Banished Realms to make a deal with Malefor. The vulture would all the powers and designations of a Dark Spawn Lord demon in exchange for servitude to the malicious purple dragon. Malefor was more than happy to agree, partly because Fagin was an obscure villain, and partly because Fagin was also spiteful and cruel in life. With that said, Malefor reformatted Fagin into a Dark Spawn Lord, and gave him the designation of Lord of sorrow and the eater of sadness and depression. When Dr. Nefarious escaped from the Banished Realms, Fagin followed him on orders from Malefor and also escaped the prison realm. Now, Fagin is currently one of Spongebob's most deadliest adversaries due to his ability to summon Heartless and be able to corrupt a person to the Dark Side with a few simple suggestions. Not only that, but he also nearly caused the destruction of Hollywood during the events of Cats Don't Dance with the help of his newfound ally, Professor Ratigan. Fagin's personality of a Dark Spawn Lord is very similar to that of another Dark Spawn Lord, Red the Demon Cat.