Here is an overview of Heidern, via publisher Atlus:
Soldiers salute! Heidern will be entering The King of Fighters XIV as downloadable content this April! He’s the leader that Ralf and Clark look up to and the father figure to adopted daughter Leona. Always keeping a cool head, Heidern uses his martial and assassination arts to take out his foes without hesitation. His hand strikes are nothing to take lightly.
Watch the Heidern reveal trailer below. View a set of screenshots at the gallery.