Bubbie is an anthropomorphic whale, she is Flapjack's devoted, adoptive single mother. Bubbie serves as the primary home and transport of both Flapjack and K'nuckles. She frequently disapproves of Flapjack's desire for adventure, but will always be won over. As told in "Oh Brother", she found Flapjack at sea in a bed of seaweed. Bubbie and K'nuckles frequently disapprove of each other's actions, especially concerning 'adventure'. She believes K'nuckles to be irresponsible, lazy, and a bad influence on Flapjack. However, Bubbie is classified as a hypocrite by K'nuckles because of how she has a consistency of being irresponsible and rule-breaking herself. It is revealed in "100 Per Census" that Bubbie's last name is the same as her first name. Flapjack lives in her mouth.