Check out the Lost Media Wiki’s article on the Kappa Mikey pitch pilots!!!
Kappa Mikey was an animated comedy series that aired on Nicktoons Network from 2006 to 2008, with a short-lived Nickelodeon run as well. The show centered around a teenage American male named Mikey Simon, who wins a trip to Japan to star in an anime series named LilyMu. The show was an affectionate parody of anime and Japanese culture, and had a unique style of animation blending; Japanese people were portrayed in an anime artstyle, while American people were portrayed in a western-animated artstyle.
The series soon become a cult classic following its cancellation, but some are unaware of the original MTV pilot. The MTV incarnation was geared toward older audiences, with more adult humor, but the original voice actors still had the same parts. According to Andrew Kaiko, one of the show's animators, the pilot had different characterization, different animation, and a hip-hop soundtrack.
MTV declined the deal, and Nickelodeon took over the project.
Update:The pilot has been found and uploaded by Sergei Aniskov(Who was one of the producers of the show) on YouTube. It's a rough cut with temp voicing and temp music.
March 29, 2018 Update
A second pilot has been uploaded by YouTube user TeamNotCrash and confirmed by the creator Larry Schwarz of being legitimate, which aired on Nicktoons as part of the annual event Nicktoons Film Festival. Its a 3 minute short that has different characterization, a different voice cast, a licensed soundtrack (Bawitdaba by Kid Rock plays during it), and an art style similar to that of the MTV Pilot. However, it looks similar to the stills that were found during the early days of the search, mainly from character designs and art style.