Spongebob Squarepants, Patrick Star, Squidward Tentacles, and Mr. Eugene H. Krabs
Debut: Spongebob Squarepants, "Help Wanted" - May 1, 1999
Creator: Stephen Hillenburg
Spongebob works as a short order cook at the Krusty Krab, run by the tightwadded Mr. Krabs. In his spare time, he goofs off with Patrick and annoys Squidward, his neighbors.
EDIT: This is the first in a series of "wide" Boot pieces, for characters I couldn't accommodate in the dimensions of the previous pieces. I have to say, this might just be my most favorite Boot piece yet. The characters all look like they should, as do the colors.
No matter how overexposed the show gets, no matter how bad the newer episodes are, this will always be one of my favorite cartoons.