Bowser

Bowser is the main antagonist of most Mario games. He most commonly captures Princess Peach because he accidentally made a spell that cast the whole Mushroom Kingdom to fall to ruins. He kidnaps Peach because he knows that she is the only one that can undo the spell. He is in charge of all the Koopas, which is why is he is also known as King Bowser Koopa. He is probably the most recognizable villain of a video game ever.

Physical Appearance
Bowser appears as tall, dangerous monster. He has a huge spiky shell on his back, as well with some attachments on his arms. He also has spikes on his tail as well. His torso and body look like a Koopa's, but he has a bigger head with horns and sharp teeth. He has claws on his hands and feet.

Personality
Bowser is not the kind of person you'd wanna meet. He is pure evil, although he does have a soft side that cares for his children and even helps Mario and Luigi in some games.