Klaus is very much tsundere.. but unlike alot of tsunderes, he has a standard issue gun (or twenty.) <-- really I'm quite sure he has a fucking armory to himself* Whenever the person he loves says something about him and/or to him, CLICK goes the trusty old gun.
Guns don't shoot people, tsunderes do.
Damn it, where is my icon muse when I need it. I DO NOT HAVE ANY INSPIRATION FOR ICONS!