|Relatives||Princess Bubblegum (Great Niece)|
|Introduced in||"Susan Strong" (mentioned)|
Gumbald is Princess Bubblegum's great-uncle. Although he has not yet appeared in an episode, Princess Bubblegum mentions him in "Susan Strong," claiming that he had cut down an entire field of taffy trees in a single night for some unknown reason. Finn and Jake were supposed to pull out all the tree stumps that he left behind but only pull out one before encountering a metallic hatch that would lead them to Susan Strong.
- So far, he is the only known relative of Princess Bubblegum that has not been "created" by her.