Pack of Crayons is a recommended character who appeared in Episode 14. In the same episode, they were seen along with some other recommended characters jumping in a van of hydrochloric acid to retrieve Bally and Marble and the rest of the Announcer's marbles collection to get 15 bonus points. They were recommended by Brom316.
The pack has a total of 8 crayons. The colors are black, brown, purple, orange, green, yellow, blue and red, in order from left to right.