Bomby appears to be a fuse bomb from cartoons or pop culture with a round black-grayish body and a beige fuse. The beige fuse is apparently unaffected by gravity. In IDFB and later seasons, his shading was a slightly different shade of grey.

He was partially wrapped in white bandages to cover the damage he had in "Why Would You Do This on a Swingset", all the way until "Don't Dig Straight Down".

Like Pie, he often has a puffy cheek, mostly because he is eating his banana and cake.