She is voiced by Tress MacNeille and when she is singing, she's voiced by
Flavio and Marita, the "Hip Hippos", are characters which were introduced by Steven Spielberg Presents Animaniacs an animated TV cartoon series from Warner Bros..
They form an extravagant and obscenely wealthy (yet often clueless) hippo couple who live in the jungle yet speak with a Barcelona accent. Flavio, the husband, was voiced similarly to Ricardo Montalban. Bored of their pastoral life, they came to the big city and settled atop a skyscraper in a lavish penthouse suite.
In the series, an overexuberant naturalist named Gina Embryo strove to keep the Hip Hippos from moving to the city by masquerading as a real estate agent and showing them undesirable location after undesirable location...but they liked them all. Geena would incur injury after injury in her quest to preserve and observe the magnificent beasts in both the shorts she costarred in.
At other times, the Hippos parodied the opera La bohème (as "La Behemoth"), the shirtless hunk advertisement for Coca-Cola, and the show American Gladiators. Brain even attempted once to use the Hippos in his scheme to rule the world by masquerading as their baby. (He was actually masquerading as the Rockefeller family's baby; the stork goofed up.)
The pair had relatively few starring roles, but were frequent guests on other shorts, often fulfilling some form of sight gag poking fun at their immense nature (such as stepping on smaller characters). They did not even appear in the Animaniacs comic book until issue #38.
Flavio’s speaking voice was Frank Welker and his singing voice was Ray McLeod; Marita’s speaking voice was Tress MacNeille and her singing voice was Wendy Knudsen.
Episode 1: De-Zanitized/The Monkey Song/Nighty-Night Toon Episode 13: Hello Nice Warners/La Behemoth/Little Old Slappy from Pasadena Episode 19: Meatballs or Consequences/A Moving Experience Episode 25: Disasterpiece Theatre/Hercule Yakko/Home on De-Nile/A Midsummer Night's Dream Episode 33: Cartoons in Wakko's Body/Noah's Lark/The Big Kiss/Hiccup Episode 42: Animator's Alley/Can't Buy a Thrill/Hollywoodchuck Episode 50: Twas the Day Before Christmas/Jingle Boo/The Great Wakkorotti: The Holiday Concert/Toy Shop Terror/Yakko's Universe Episode 80: Dot's Entertainment/The Girl with the Googily Goop/Gunga Dot Episode 88: Papers for Papa/Amazing Gladiators/Pinky and the Ralph Episode 90: Pitter Patter of Little Feet/Mindy in Wonderland/Ralph's Wedding Episode 99: Birds on a Wire/The Scoring Session/The Animaniacs Suite Wakko's Wish