The last thing he remembered was his warp pipe going off in the wrong direction, before the blackness hit. Now, his consciousness was slowly returning. Even without opening his eyes, he could tell this was not his fortress, nor the princess's palace. He was on his back, atop some stone thing, his spikes gouging into the smooth surface. Strange scents came to his big snout, strange plants, animals, and people. There was wind too, he could feel a gentle breeze on his scales. He heard a voice, a human woman from the sound of it, speaking from nearby.
Well, laying here like a stomped goomba wasn't going to get him anywhere. With a grunt, he levered himself off of his back and pushed himself upright. Opening his eyes, he saw several strange beings. He didn't recognize the species of most of them, but some were humans. None were Mario fortunately. Or that other tall green fellow that sometimes helped Mario, what's-his-name. Right, Luigi. Only one other seemed to be up and about at this point. He got to his feet and began stomping forward towards Queen. Was she the one who so rudely kidnapped him? He wasn't sure yet, but if she was a fellow prisoner, she might be useful. Enemy of my enemy and all that.
He pointed a claw towards Queen. "You. Human," Bowser began, speaking in an angry growl. Not angry at her in particular, but just angry in general at the situation. "What world is this? And who dares to bring me here? I'm gonna burn them to a crisp."
(No major actions, just Bowser waking up and talking to Queen. Also, as for being a low charisma killer, he's Bowser. Enough said.)