Captain Jahn is a character that wore a mask, to distinguish him from the other looking Jahns. It is a common theory saying that Jahn and Vinesauce made all the bad miis go away.

The Jahns were originally made by Vinny to test how different they could be and to test out the AI.

The Name Jahn came from a guy that Vinny knows of that calls everyone "Jahn" for no real reason.