Bowser, the females Birdo, Koopa Paratroopa and Goomba are from Nintendo's Mario and this screenshot's taken from Valve's Garry's Mod.

Having enough of trying to marry Princess Peach, knowing that he failed many times and that she's not interested in him, he decide to flirt and marry any female member of his Army, including a Birdo, a Paratroopa and a Goomba, and make her his royal consort. These ladies seems quite smiley about his romantic ways, unlike the Princess of the Mushroom Kingdom, of course.