Not much is known about Kilnas, he first showed up 1000 years ago on the island of Hetand and has been killing Toa since then including Toa Soles who sacrificed himself to save his Matoran village. He has been hunted by Buskyte. ever since then.
He is heavily inspired by Zoom from the Flash tv show.
I really like the legs. They remind me a lot of a concept Mega Man. I’m not sure how to feel about the forearms, the way they’re shaped is a bit odd but I can’t tell if it’s a good odd or a bad one. My suggestion would be to have something in the build flow back, maybe the horns ala Flash/Zoom? Perhaps the back even.