Nobody has ever seen him. You immediately forget that you've seen him.
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Ken Kaioh is the younger brother of Kaioh Michiru, as well as the Knight of Neptune. He is one of the most accomplished knights of the group but also the most forgotten.
The second born of the Kaioh family and the younger brother of Kaioh Michiru, Ken Kaioh was born in the shadow of his much more talented sibling. His parents sent him off to private school overseas, focusing all their attention on Michiru. He was not a popular child at the academy which he attended, and while he was talented in his own right, he often became a target of bullying.