Nimbus

Strife, real name Nimbus, is an Equestrian Enenra (Living cloud of smoke of Japanese mythology) and former second-in-command of The Storm King from the MLP movie comics who betrayed Storm King by allying with Captain Celaeno and her pirates, and left him, as Storm King threw him overboard for his betrayal and resulting in Celaeno and her crew being forced to work for him.

MLP Movie Comics
Coming soon...

Role in the series
Strife, ever since he was thrown overboard, had since been rescued by Stratus Skyranger and is now under the loyalties of the Guardians of Harmony. He had been drafted into Storm King's army after his homeland of Nimbiny had been destroyed by him and his forces, and he sought Celaeno and her pirates to loot just enough treasure from Storm King to restore it back to it's glory, but since being lost, he ended up as an assistant for the Guardian Elders. Though his kind is not mentioned in the comics, it is in the SAFAC series.