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Kai Narasu was a scientist who originally wrote a paper about Sonic being nothing but a robot. However, his theories were proven false and he ultimately lost his tenure. Working for S.O.N.I.C.X., he created an army of Sonic clones in order to tarnish Sonic's name. However, the clones were accidentally made with a different colour. (SX: #37)
- Kai originated as an extremely minor character who appeared in episode 2 of the anime, where he appeared on a news report explaining the same theory that Sonic was a robot.