The song "Heroes" by Japanese rock band Brian The Sun became popular after it was used as the ending credits song for the first season of anime "My Hero Academia". Kevin Osmond, a (at the time) 13-year-old musician known for his odd remixes, decided to remix the song. The remix, which would be nicknamed "Kevin Osmond's Villain Remix" has not been found in a final or unfinished form. Along with this, there was supposedly a music video of the song, which would be just an edited version of the original version with Kevin's own edits, however this hasn't been found either.
UPDATE THIS SONG IS AVAILABLE ON KEVIN'S NEW ALBUM however the music video is still lost