Blackbeak

Blackbeak was an Equestrian Griffin and was once the leader of the Royal Griffon Defense Force in the comic My Little Pony: Legends of Magic Issue #4, where he opposes Flash Magnus as he attempts to stop an unstable storm in their territory, forbidding their interference as they believe they are responsible out of threat of declaring war. But Flash renounces his position in the Royal Legion when he is denied permission to help the griffins when they have trouble getting the storm out, and is aided by his comrades after being inspired by his bravery.

Role in the series
It's revealed in The Camping Episode 2.0. that, following the unstable storm incident, Blackbeak was demoted as the leader of the Royal Griffin Defense Force as punishment for denying outside assistance and endangering many griffin soldiers. However, following this, Blackbeak goes AWOL and leaves the military after being utterly angered by this decision, and Magmatacus ends up tricking him into activating a focal point in his underground penal imprisonment of Mount Penance in return for getting him back in his position, only to betray him and result in his untimely death.