Bubbie is very sassy, and can be extremely over-protective when it involves Flapjack's safety. She dislikes Captain K'nuckles' influence on Flapjack, as it always leads to trouble, and all Bubbie wants is for Flapjack to remain the sweet angel he really is. Regardless of K'nuckles' obnoxious attitude towards her and Flapjack, she cares about him like family. In one episode she even admitted that she was proud of K'nuckles for attempting to lose weight.
At times, Bubbie can feel lonely due to Flapjack's and K'nuckles' adventures, so she goes into Stormalong to peep on its citizens and find out their secrets in order to pass time.
- Her mouth is used as a home for K'nuckles and Flapjack.
- She dislikes bragging, as she believes it can only cause havoc in life.
- Bubbie was originally planned to be a whale-shaped submarine, however the idea was used for Whoosh.
- Bubbie has a bell collection.
- Bubbie is able to speak through her blowhole.
- Bubbie wears glasses (that usually aren't visible unless removed).
- When the scene changes to the inside of Bubbie's mouth, her tongue never moves while talking; only her uvula does.
- In the episode "Bubbie's Tummy Ache", it is shown that Bubbie is able to survive on land and even walk, as she entered a pie eating contest and was standing upright. However, in Low Tidings and Oh You Animal!, she stated that land is dangerous for whales, likely referring that whales dry out on land.
- Bubbie's name is likely derived from 'Bubula', a Yiddish name for 'baby', which is what she calls Flapjack.
- Bubbie's voice actor (Roz Ryan) is also known for voicing Cake the Cat from Adventure Time, Witch Lezah from The Looney Tunes Show, Cyborg's Grandmother in Teen Titans Go!, and Thalia in Disney's Hercules.
- She is extremely ticklish.
- The term "Bubbe" is a Jewish word for grandmother. Even though "Bubbe" isn't Bubbie's name its pronounced the same way.
- In Oh Brother!, it is shown that she discovered an infant Flapjack wrapped in seaweed, and because of his extreme angelic cuteness, she adopted him.