Rainbow Pupsters are Dog-Rainicorn hybrids. They are offsprings of Jake and Lady Rainicorn. Jake was surprised when he found out that he was going to have puppies. They were first shown on Princess Bubblegum's Heart Monitor, in the episode "Lady & Peebles." The 5 children are born in the episode "Jake The Dad."
- Jake The Dad
- One Last Job (Only Jake Jr. Appeared)
- Jake Suit (Only T.V. Appeared)
- Time Sandwich
- Apple Wedding
- Another Five More Short Graybles (Only Jake Jr. Appeared)
- Puhoy (Mentioned)
- Dungeon Train (Mentioned)
- James (Mentioned)
- They actually age rapidly, because they turn ages quickly in every episode they appear.
- Jake Jr has a beard now, so does T.V.