The Greatest Ever, released in 2009 by the musical duo, “JT Music (or at the time, JT Machinima)” was one of the first hits JT Music made.

It has 3 characters, Character 1 is (supposedly) SkullKruncher13 as said by the lyrics. Character 2 is an unknown kid that battles with SkullKruncher and loses, (seen near the last verse), and a random “mystical” character during the speech before returning to Character 1. The Greatest Ever was initially a project not meant for online, as it was just a video for family and friends. However, after it was accidentally uploaded to YouTube, it was a major success, gaining many views. It inspired the duo to keep on making songs.
Original Cover:

Remastered Cover

Sequal Cover