Please skip the video to 25 seconds 

This video shows at what rate do all 3 Chubby-Man go up and down, and how a simple change like this can give the three individual Chubby-Man some kind of characteristic.

You can also see how the Chubby-Man aren’t the main characters in this game, but side characters which act like hurdles for the main character, the Chubby-Man/ Men obstructs the in path in the game play and makes is ever so slightly difficult for the player.