Yummy Bear debuted in Yummy Bear Nado as Love's pet. He can talk, but very minimal words such as "jelly-jelly" (as in jellybean, which he loves) and "fan". Love made him super intelligent, but also prone to fits of anger (similar to Music) and the only way to control him is through jellybeans.
When the girls head to the jellybean festival, Yummy is put inside a containment chamber, which he easily escapes from. Using the fan ventilation system through Love's computer, Yummy is able to spawn several tornado which he uses to gather all the jellybeans.
Chewie (and to an extent, Rudie) is not real fond of him.
Yummy Bear becomes a recurring character in season 3 and in the episode Bye Bye Baby helps Baby defend HJ5's house when General Nofun sends his new evil intern to battle Baby and the Monster Pets.
Yummy Bear appears to be the leader of HJ-5's Monster Pets.
His appearance changes in season 3, he now wears glasses and a bowtie.
Yummy Bear and the other Monster Pets in Season 3.
Baby and Yummy Bear with the glitterslime cannon.
Dancing Monster pets performing.
The monster pet marching band.
Cupcake leading the monster pet marching band.
Monster Pet hugging.
Nap and Yummy Bear.
Yummy Bear, Pickle and Cupcake.
Monster Pets realising they’re about to be discovered eating the jelly beans.
After the Tour Bus teleportation jump.
Apparently a hyperfast teleportation jump can cause messy hair.
Yummy Bear getting Rudie’s attention.
Yummy Bear has an idea.
Yummy Bear, smug genius.
HJ5 looking around the convention centre.
G worked out that Yummy Bear helped Rudie alter the teleportation drive.
Yummy Bear realizing how much trouble he is in.
Love and G are so busy they don’t notice Rudie.
Yummy Bear is the only one who sees Rudie crawl by.