KN-5

KN5 is a living computer virus and the Kuroninja of Earth 5. He doesn't appear that much in the series because for some reason, Kuroninja’s Earth-0 Counterpart doesn't know what to do with him.

History
The Kuroninja of Earth 5 was an evil hacker who almost destroyed Earth 5. He was then fused with the computer virus that he created. Eventually he was defeated by Shiori Sana and he was sent to the Wasteworld, an outer dimension with seemingly infinite layers, so he wouldn't cause any more damage.

Later, in 2018, most of Kuroninja's work was purged, and Kuroninja claims that it was due to a virus that deleted his work. It is possible that the virus was KN-5.

Kuroninja eventually met KN5 in the Wasteworld. KN5 made several more appearances, and he also won a Kuroninja Award for Worst New Character. KN5 then destroyed the trophy. This is the only trophy that has been destroyed for the 2018 Kuroninja Awards.

Trivia

 * KN5 was supposed to be the main villain of Kuroninja X, but it became the Bioninja Organic Organization instead because they were more interesting.
 * Kuroninja's Earth-0 Counterpart hates KN-5 because apparently he gets writer's block whenever KN-5 shows up.
 * KN-5 is the first chaotic evil Kuroninja introduced to the Multiverse.