He's a leader of the group call the Kirsch Crusher Corps. And pretty much the bearer of one seed that's similar to an uncanny resemblance to the Tree of Harmony. He's a former captain belonging to King Sombra's Right.
His coating of his fur is somewhat gray and appears to have a bearing resemblance to Flash Sentry(which he's doesn't know his relation between him and sentry). He's got a knight armor and a black cape. His Cutie Mark's exactly the same as Flash has but with a symbol of a nuclear or hazard atop of it.