|First appearance:||Paste Makes Waste|
|Last appearance:||Substitute Creature|
|Voice actor:||Dee Bradley Baker|
Elmer Skloo is a student in Pokey Oaks Kindergarten. He has curly hair and wears thick glasses. He appeared in "Paste Makes Waste," where he became a giant monster and wanted revenge for everyone picking on him because he was eating glue. He befriended Buttercup at the end when she apologized for making fun of him. Elmer is voiced by Dee Bradley Baker.
- Paste Makes Waste(debut)
- Beat Your Greens(cameo)
- Imaginary Fiend(cameo)
- Gettin' Twiggy With It(last cameo)
- Substitute Creature (last official appearance)
Likes & Dislikes
- Eating paste
- Being bullied
- In "Speed Demon", three Elmer Skloo-like figures can be seen running from school after the bell rings.
- It's implied that Elmer has eyesight problems since his glasses are very thick.
- It is unknown how he returned human after turning into a paste monster.
- His name is a pun on the glue brand Elmer's Glue.
- His design was slightly changed during the last two seasons of the show, he was given a round head.
- Elmer was one of few characters who didn't return in the reboot, although he did make a cameo in The Wrinklegruff Gals.