Stimpy is a character who made the Happy Helmet and is friends with Ren. He didn’t appear in any Mario games, but he did appear in 2 episodes called Happy Happy, Joy Joy! and Favre's Invention along with Ren.
Appearance[]
He looks like a red dog like character with a blue nose.
Trivia[]
- Ren broke the Happy Helmet, but he is still friends with Ren