Adults are characters from the Bubble Guppies. They love the Bubble Guppies, and enjoy having fun with them. They appear in some episodes or only one episode of Bubble Guppies. Some of the adults on the show are:
- Doctor
- Mr. Grouper
- Avi's Mother
- Audience
- The Marching Band
- Customers
- Mr. Grumpfish
- The Astronomers
- Director Crab
- Allergic Wolf
- Piggy
- Crabs
- Lobsters
- Snails
- Announcer
- Crab Scouts
- Pilot
- Passengers
- The Mayor
- Mr. Langoustine
- Martin
- Dot
- Mail Carrier Snail
- Snail
- Pirate Lobster
- The Abominable Snowman
- Zookeeper Jo
- Witch
- The Big Bad Wolf
- Little Red Riding Hood's Grandma
- The Three Bears
- The Giant
- Dusty and Rusty
- Dentist
- Jackson's Mom
- Truck Show Commentators
- Frank the Tow Truck Lobster
- Ms. Duey the Librarian
- Scampini Brothers
- Ringmaster
- Daisy
- Marty Snailer
- Ogre
- Pinkfoot
- Pronto
- Sir Mulligan
- Archaeologist
- Engineer
- The Great Drewdini
- Miss Jenny
- Shelly
- Officer Miranda
- Bobby
- Arctic Dan
- The Night Wizard
- Dr. Martin
- Mr. Petrol
- The Oyster Bunny
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