Funny is a rejected member of the Mickey Mouse Clubhouse, and is Mickey Mouse's supposed 'special friend'.
Funny basically just looks like Mickey Mouse, but is tinted to be blue, thus making him unique and original. Funny, just like his name, thinks he is Funny, even when at some points of time, he is not.
Nobody truly knows where Funny came from, but he met Mickey when he was one of Albert Einstein's lab rats, whom he'd secretly hang out with while Mickey was tested on. In the same manner as Mickey, he mutated into a weird mouse creature with human-like limbs once he was the one who was tested on and an experiment went wrong. While Mickey Mouse was becoming popular, he started a satanic TV series filled with subliminal messages, that is Mickey Mouse Clubhouse. Due to Funny physically being unable to be Funny at the time due to some psychiatric problems he was involved in, he was eventually rejected and thrown and locked inside of the basement where today he screams for help to be let out. As each day passes by, Funny starts to slowly devolve into insanity.