Squig is a large flying worm that Iris adopted as a pet. Although he is not seen that often, he accompanies Iris on all her adventures as both her companion and sometimes her mode of transport. He is about five times as big as Iris, is black and red with patterns down his back, and has a small set of wings at the end of his tail.
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| Main Characters |
| Ruby Gloom | Doom Kitty | Iris | Misery | Skull Boy | Frank and Len | Poe | Scaredy Bat | Boo Boo | Mr. Buns |
| Minor Characters |
| Mr. White and Mr. White | Squig | Venus | Edgar and Allan | The Moon | Mr. Mummbles | The Skele-Tunes | Misery's family |