Greg Fou Seberg

Greg Fou Seberg is the dark-haired heir of House Seberg, a military line that supplies the kingdom with officers. In the otome game he is the 'athletic route' — direct, hot-blooded, easily moved by displays of effort and honesty, which makes him hilariously vulnerable to Marie's act.

He despises courtly intrigue and considers himself a 'true warrior', a stance that does not survive contact with Leon Fou Bartfort, who pilots a literal Old Humanity war machine instead of fighting with a sword like a gentleman. After he and the rest of the clique lose the duel, he is stripped of his officer commission and reassigned to manual labour.

Greg's later arc is the simplest of the five idiots: he hits things, he gets tired, he hits more things. He stays loyal to Marie out of stubbornness more than anything and is one of the few who occasionally does useful physical work for the household.