<P> Louise Belcher is the youngest of the Belcher siblings and is revealed to be 9 years old in season 1 and is still 9 by Christmas five seasons later . In spite of being the youngest, she usually dominates her two older siblings by "wear (ing) down your self esteem over a period of years ." Precociously intelligent, manipulative, and aggressive (even towards adults), she is more than willing to exploit people if there is anything to be gained, and has a history of gaslighting her siblings, especially Tina . She has an offbeat and dark sense of humor and picks locks as a hobby . Louise always wears her signature pink hat with bunny ears, regardless of the time of day or situation; to date, viewers have never seen her uncovered head . She claims that she has "a raging staph infection under here" in the episode "Synchronized Swimming" when they try to make her take it off . In "Ear - sy Rider," when a high - schooler stole her hat from her, her head was off screen, then she wore a hoodie till she got it back . Louise is not immune to breaking her tough character persona, however: she called Bob "daddy" until she was eight, felt guilty about almost electrocuting her sister to death, still believes in Santa Claus, has a disturbing crush on a boy - band member, and proclaims she does love her family in the face of death at the end of season 4 . Since she was a baby, Louise has always liked Bob more than Linda, opting to spend more time with him as she finds him much more interesting; it can generally be assumed that Louise and Bob have a very strong relationship, although she is the most prone amongst her siblings to mock him . In "Carpe Museum", Louise accidentally reveals her plan to take over the family restaurant when Bob retires, after renaming it to "Louise's Burgers ." </P> <Ul> <Li> Gayle (voiced by Megan Mullally)--Linda's neurotic artist sister, the aunt of Tina, Gene and Louise and the sister - in - law of Bob . Bob dislikes her, much to Linda's consternation . She is desperately lonely and once fell in love with Bob because, Linda explains, she always wants what Linda has . However, men often take an interest in her, including Dr. Yap, Mort, Mr. Frond and Mr. Fischoeder . She loves cats and may suffer from some form of factitious disorder, as she often fakes injuries . </Li> <Li> Al (voiced by Sam Seder)--Linda's father, father - in - law of Bob, and the maternal grandfather of Tina, Gene and Louise . He rarely speaks, is hard of hearing, and wears a hearing aid . He accompanies Gloria everywhere . He has a fetish for the sound of popping balloons . </Li> <Li> Gloria (voiced by Renée Taylor)--Linda's mother, mother - in - law of Bob, and maternal grandmother of Tina, Gene and Louise . Bob doesn't like her very much and he always tries to hide from her when she and Al come over to visit . </Li> <Li> Big Bob (voiced by H. Jon Benjamin in "Bob Fires the Kids," Bill Hader in "Father of the Bob")--Robert "Big Bob" Belcher, Sr. is Bob's father, the father - in - law of Linda, and the paternal grandfather of Tina, Gene and Louise . Like his son, Big Bob is a restaurateur who owns his own business called "Big Bob's Diner ." He's shown to be a tough loving father towards his own son, as shown in flashbacks . Since his pre-teens, Big Bob has been very controlling of Bob and has put him to work most of the time . He enjoys line - dancing, which he practices at the bar next to his diner . </Li> </Ul> <Li> Gayle (voiced by Megan Mullally)--Linda's neurotic artist sister, the aunt of Tina, Gene and Louise and the sister - in - law of Bob . Bob dislikes her, much to Linda's consternation . She is desperately lonely and once fell in love with Bob because, Linda explains, she always wants what Linda has . However, men often take an interest in her, including Dr. Yap, Mort, Mr. Frond and Mr. Fischoeder . She loves cats and may suffer from some form of factitious disorder, as she often fakes injuries . </Li> <Li> Al (voiced by Sam Seder)--Linda's father, father - in - law of Bob, and the maternal grandfather of Tina, Gene and Louise . He rarely speaks, is hard of hearing, and wears a hearing aid . He accompanies Gloria everywhere . He has a fetish for the sound of popping balloons . </Li>

Who plays aunt gayle in bob's burgers