Tarnished and Reign! Tarnished is more of a fighter/guard and add Reign to foals, please. <3
Edit: Tarnished has Equus Mutatio, Disease Manipulation, and Trait Immunity. So I mean, he would probably be better suited to the position of spy. He can shift into anything he wants, he could be sent to sabotage another kingdom by spreading disease or sent on assassination missions to kill via illness or otherwise (absolutely everyone would need to be on board with this before I'd agree to it, because ily all), and trait immunity would be helpful against telepaths and others who might detect him.
Edit: Tarnished has Equus Mutatio, Disease Manipulation, and Trait Immunity. So I mean, he would probably be better suited to the position of spy. He can shift into anything he wants, he could be sent to sabotage another kingdom by spreading disease or sent on assassination missions to kill via illness or otherwise (absolutely everyone would need to be on board with this before I'd agree to it, because ily all), and trait immunity would be helpful against telepaths and others who might detect him.