Origin
After the Vampire Queen Marceline stumbles across an enchanted guitar, a fiery lion like goat manifests itself from within the guitar and entices Marceline to play the guitar promising that he shall grant any wishes she desires after she completes a song. Marceline is intrigued and threatens the creature if he doesn’t comply before breaking out a song using the musical instrument. At completion of the song, Anbaris announces that he is free, after being trapped within the guitar. Infuriated that she was lied at, as Marceline chases Anbaris, but pauses when Anbaris runs to a small boy that excitedly embraces the animal, overjoyed at having him found. The boy thanks Marceline who softens a little bit at seeing the reunion of the boy and his pet as it was her wish unfulfilled that to see her long lost pet Pickles. Marceline plays a song with the boy and Anbaris.
Creation
Anbaris is a character from the Adventure Time franchise created by Pendleton Ward. He first appears in a back up story in the mini series Adventure Time: Marceline Scream Queens #1 written by Jen Wang released in 2012.