|Japanese name:||キース アニアン|
Interestingly, despite being pitted against Jomy and the Mu several times throughout the series, Keith's portrayal is similar to that of an anti-hero and somewhat of a second protagonist, rather than a "villain". His connections and experiences with the Mu ultimately lead him to betray Grandmother, and the SD system itself.
In the DVD-only Epilogue episode of the anime, it is shown that in an unknown future Keith is reincarnated and reunited with Jomy on the successfully-terraformed Earth.
Voiced by: Masaya Oki (1980)
Takehito Koyasu (2007)