1. Recess gang
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  2. Hey Arnold neighborhood
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  3. Team Rocket Power
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  4. Rugrats babies
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  5. Powder Puff girls
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  6. Animaniacs
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  7. Bonus: All That crew
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    Not a cartoon but they count!
  8. Doug and company in Bluffington
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    Suggested by @lizabeth
  9. Aaahh!!! Real Monsters
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    Suggested by @lizabeth
  10. Rocko's friends helping him face the modern world.
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    Suggested by @lizabeth
  11. The Tiny Toons, Acme University's finest
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    They're all a little looney
    Suggested by @TheSteve
  12. Arthur's friends
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    3rd grade never looked so cool!
    Suggested by @bware427