To unlock the characters listed below, fulfill the corresponding requirement. Keep in mind that after being unlocked, each character must still be purchased from the in-game store.
- Bunny Bravo - Complete the Soupered-Up Chemical X Championship
- Dee Dee - Complete the Soupered-Up Booger Championship
- Eustace - Complete the Soupered-Up Cowardly Championship
- I.R. Baboon - Complete the Chemical-X Championship
- Mandark - Complete the Souped-Up Chemical X-Championship
- Mojo Jojo - Complete the Souped-Up Porkbutt Championship
- Muriel - Complete the Souped-Up Cowardly Championship
- Professor Utonium - Complete the Soupered-Up Porkbutt Championship
- Suzy - Complete the Souped-Up Booger Championship
- The Red Guy - Complete the Flipped-Out Chemical X Championship
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