Crusader

Origin

Crusader is a Skrull who came to Earth and made friends with newbie hero Freedom Ring. After he died, Crusader took his Freedom Ring in remembrance of his young friend for that is the "Skrull way" when a fellow brother dies. 

History

Later in his hero life Crusader helped the Avengers fight the villainous Titannus.  Captain America (Steve Rogers) was impressed by the young heroes methods.

Crusader joined The Initiative in the hopes of getting a registration card.  In the story arc " Secret Invasion" Crusader took the human's side, though they did not know he was a Skrull.  Proving himself a worthy hero to the planet Earth, he was even complimented by Nick Fury of the Secret Warriors. At the end of the Secret Invasion Story arc, Crusader was the one who fought and killed Criti Noll, who had been impersonating Yellow Jacket. During the fight, it was revealed that Criti did not know he was a Skrull either. After the war was over many heroes including Gravity were congratulating him when  3D Man shoots him in the head simply saying "What?". Though while on the ground dying, he looks back wishing it could all have ended differently when he suddenly disappears. 

Powers

Aside from the standard Skrull powers of shapeshifting and regeneration Crusader has a power ring called the Freedom Ring, which is made of a fragment of a cosmic cube. It grants limited reality warping.