|For the original version, see Fizzarolli.|
- "Hey, hey, hey, hey, hey, Implings! It's me, the Robotic Fizzarolli! Shipped from Big Ozzie's factory to bring you a wonderful show celebrating Loo Loo Land, spelled with Os, to avoid lawsuits! Hit it!"
- ―Robo Fizz, introducing himself to his audience
He is a major supporting character who made his debut in the Helluva Boss episode "Loo Loo Land".
Being based on Fizzarolli, Robo Fizz has the same appearance as the jester demon. His limbs appear to be more like tentacles than proper jointed limbs, able to flex and bend far more than normal joints could.
He speaks with a stutter often sparking indicating that he is in a state of disrepair, or is of shoddy craftsmanship. When set on fire later on his outfit is destroyed showing black segmented limbs, a cylindrical upper torso, two ear-like appendages and a set of glowing lime/yellow eyes.
While he's a robot and his status as alive is debatable, he's a sentient individual capable of rational thought and speech.
He seems to be content with his job as a child entertainer and a showman in Loo Loo Land. However, he can be extremely disdainful and belligerent, as he mocked Blitzo for his failed attempts at showbiz and had no qualms about getting in a fight that ended with Loo Loo Land burned to the ground.
- The design for Robo Fizz, and in extension, Fizzarolli, himself, were revealed during the BLM Charity Stream.
- In "Loo Loo Land", there are posters of Robo Fizz that advertises his sexual services, likely leading to Blitzo's nickname for him.
- There is also a children's toy version of Robo Fizz called "Fizzi Buddy" advertised in the park which features over 100 phrases and is only 48% asbestos.
- Robo Fizz was the first character to pronounce Blitzo's name with the 'o' at the end. The second being Verosika Mayday in Spring Broken, and the third being Wally Wackford in C.H.E.R.U.B.
- In the song that he sings, some lyrics mimic that of "Inside of Every Demon is a Rainbow" from Hazbin Hotel.
- In the carnival show, Robo Fizz mentioned that he was shipped to the amusement park from a place called "Big Ozzie's Factory".
|Hazbin Hotel||Helluva Boss|
|Main characters||Charlie Magne • Vaggie • Angel Dust • Alastor • Husk • Niffty||Blitzo • Millie • Moxxie • Loona|
|Supporting characters||Cherri Bomb • Fat Nuggets • Sir Pentious • The Egg Bois • Razzle and Dazzle • Katie Killjoy • Tom Trench||Stolas • Cletus • Collin • Keenie • Octavia • Robo Fizz • Verosika Mayday • Wally Wackford • Striker|
|Minor Characters||Crymini • Exorcists • Helsa von Eldritch • Lilith Magne • Lucifer Magne • Mimzy • Travis||Barbie Wire • Catfish Monster • Eddie • Joe • Lin • Loo Loo • Loopty Goopty • Lyle Lipton • Martha • Mrs. Mayberry • Ralphie • Sallie May • Stella • Verosika's crew • Vortex|
|Overlords||Alastor • Rosie • Valentino • Velvet • Vox|
|Other Characters||Arackniss • Baxter • "Henroin" • Molly • Seviathan von Eldritch||Fizzarolli • Tilla • Mammon|