This anon would like to see something setting Sweden off into a totally insane berserker rage. It can be because he's a Viking warrior, or modern day where something happens to send him over the edge - whatever it is, something happens, and he just goes nuts. Since Denmark's the only Nordic who's comparable in size, it's up to him to try to stop him and/or take care of him afterward. They can be brotherly, or in a relationship, or hate each other's guts - it's totally up to you, anon! Just - Denmark and Sweden!!!
Sweden + Denmark or Sweden/Denmark, berserker Sweden