Mushroom (commonly known as Shroomy or Shroom) is a supporting character that first appeared "In the Dark". Because he grew up in the dark, there are a lot of things he doesn't know. He appears to be as annoying as Orange. He appeared in Broccoli Obama's Campaign Video along with Tomato, Plum, Pot Roast, Turnip and Granny Smith. He later appeared in "Annoying Ways To Die" being smeared in batter, deep-fried, and then being crushed by an anvil. He later appeared in the crossover episode, "Ned Meets The Annoying Orange" during the embedded trailer for The Marshmallow Show, which was to air its first episode of the 4th day of June in 2014. He then became a recurring character who is Marshmallow's co-host on The Marshmallow Show (until their show was cancelled by Dane Boedigheimer. Instead of being called "Mushroom" in the show, he is called "Shroomy". He appeared in "Marshmallow's Missing" filing a missing report to Milk Detective, here called "Shroom".
| Main Characters | Recurring Characters | TV Exclusive Characters |
|---|---|---|
| Orange | Apple | Nerville |
| Pear | Squash | Apple |
| Midget Apple | Knife | Coconut |
| Marshmallow | Liam the Leprechaun | Peach |
| Passion Fruit | Captain Obvious | Tomato |
| Grapefruit | Nude Dude | Banana |
| Grandpa Lemon | Dr. Bananas | Pineapple |
| Orange's Sister | Zoom | Ginger |
| Corey | Gaming Grape | Broccoli Overlord |