Bowser

King Bowser Koopa Sr., also known (in Japan) just by his surname Koopa, is the main antagonist of the Mario series. He rules over the turtle-like Koopa Troopa race and is constantly striving to expand his kingdom by conquering the Mushroom Kingdom, although his plans are always spoiled by his arch-enemy Mario. He's in love with Princess Peach, and his attempts of conquest always include kidnapping her in one form or another.