Board Thread:Naruto Discussions/@comment-1471207-20160126052730/@comment-734582-20160126093506

Littlemetzler wrote: Is anyone else a little confused at his abilities being hiden and not Kekkai Genkai. How are 2 extra pairs of arms, a 3rd eye, and special sweat glands not genetic? How does one learn to grow extra limbs and eyes exactly? Kekkei Genkai is not so much a Genetic Ability as it is a bloodline (inherited) power. Kidomaru's abilities aren't gained from his parents, it's from experiments.

So his abilities may (or may not) be genetic, but they're not inherited, so not Kekkei Genkai.