U21

U21 is a Callum Morrin variant, he is the editor of the U8 death clip seen in the video "something is wrong please help".

U21's involvement in the Callum Morrin multiverse is yet to be established, but this Callum Morrin variant seems intent with editing footage and remaining relatively quiet. No videos are said to be on the channel that bare U21's title, however there are multiple that are tagged with "Edited by U21", often posted by other Callum Morrin variants.

U21's existence is strange and mysterious, it would appear that they enjoy editing the footage found on the heyguyscallummorrinvlogshere channel ,but also seem to have access to it before other Callum Morrin variants do. Some speculate that U21 is truly disturbed Callum Morrin variant, who takes pleasure in watching what is seemingly his own death.

Appearance
The appearance of U21 is unknown.

Trivia

 * U21 seems to edit his videos in Premiere, given that the files uploaded to the heyguyscallummorrinvlogshere channel are in H.264. This fact implies that U21 is at the very least 20 years of age, given that is when most Callum Morrin variants have access to the Adobe Suite.
 * Whats 9 + 10?