Truckle

Truckle:
In Cheese Jump and Cheese Maze, the player sprite is a truckle [P1] with a slice taken out. "Truckle" is the word for a wheel of cheese.
Colors:
Canary yellow makes up most of the truckle, Burnt Yellow makes up the inside of the slice taken out, and Black is the outline.
In reverse mode, Blue Orchid makes up most of the truckle, Medium Blue makes up the inside of the slice taken out, and White is the outline.
More information about the colors.

History: 

The player sprite was first created for "Basic Doodle Jump", the base code for Cheese Jump. In "Basic doodle jump" (Modified), Ian changed the color of the player to yellow to make it easier to focus on. Seth commented on how it kind of looked like cheese and that he should make it into a block of cheese, but he didn't know how to do that.
Later in "Less basic doodle jump", Seth changed the player sprite so that it was split into three sections, and Ian set the top one's color to yellow (#fcff45) and the bottom two to orange (#e0ad02) [P3]. In Cheese Jump Alpha, the player was fully redesigned into a small version of the truckle we all know and love today.
When Seth created the Gamma versions of Cheese Jump, he scaled up the resolution of the truckle to its current state [P1].
When Ian and Jack were making Cheese Maze, Seth made the missing piece [P4] of the truckle, which is used in an easter egg in level 10.