Are roy and marth gay

Yeah...probably.

Royal blood people are know to act or look a little eccentric, and I believe Marth's creator used this cliché...in a exagerated way? And If you didnt know, he wear that girl tiara cauz he got it from his sister. In FE3, he marry Sheeda at the end....so he's not gay, but his girly and narcissic manners in Brawl tends to make people he is GAY. I did say he's gay in Brawl, but not in his previous games.
For Roy....I dunno why you ask, but he doesnt look gay at all. He's just paired a lot with Marth by the fangirls.