3

3 is one of the members of the worst friends.

He is shown as the shortest of the group and wears a bowtie.

Personality
He's the youngest of the group and has a knack for inventions.

Trivia

 * 3's eyes are always closed throughout the series for "stylistic effect"
 * 3 has a Game Guy (GameBoy) that he carries around with him everywhere.
 * 3 has a pet blob named Trosh
 * 3's bowtie is mechanical and can speak to 3 as an AI at any time.