Mario: "Hey, Koopa, you're such a stubborn fellow. Won't you give up on Peach already?"
Bowser: "Well I regret to inform you that's unacceptable. I'm her destiny, no doubt about it."
Peach: "Won't the both of you stop it? Just look at the mirror..."
Both: "Well you don't have to say such a thing. Men compete with their hearts!"
Bowser: "My sweetest Peach-girl, I'm so in love with you. If you can't understand that, I'll kidnap you and seal you up again."
Mario: "I'll steal you back, risking my life, but I can not steal your heart..."
Peach: "Cut it out, the two of you, are you listening to me at all?"
Both: "The tsundere in you is also charming, and men compete with their hearts!"
He's not CREEPY. I just think he's an idiot who's seen too many John Cusack movies where persistence gets the girl no matter how big an ass you make of yourself.