Despite their name, none of these 3 Mikes are the real Mike himself. The 3 have been acting as Mike but weren’t ever the real Mike so they have no idea who he really is. With the Mike costumes off, they’re really a Pippins, Shadowguy, and a Zapper. All of them pretend to be the real Mike, taking on his responsibility. The 3 Mikes are all different however, being known as Motormouth Mike, Cat Mike, and Tall Mike, each with their own personalities. 

The 3 “Mikes” from Deltarune

Mizzles are free-spirited, wistful, and often playful. This is seen in their propensity for sleep, their occasional use of puns, and their dreamy, distant manner of speech. This is further supported by their Recruit descriptions, where it states they "enjoy doing fairy/princess-like things arbitrarily", implying they are not genuine royalty and simply enjoy roleplaying. They appear to be based on water nymphs/sprites and are likely housed in water coolers due to churches containing water coolers