Bowser

Bowser is the main antagonist of the Mario series, most commonly known for kidnapping Princess Peach. His first appearence was in Super Mario Bros., and since then, has changed in both shape and form, and goal. He seems to be a turtle of some sort. He also makes a minor appearance in Wreck-It-Ralph.

Past
Not much is known about his past or his desire to become evil. However, in Super Mario World 2: Yoshi's Island, he appeared as a baby. He was still evil at that age. He was babysat by Kamek, who in the present time is Bowser's assistant.

Personality
He seems evil and never gives up. Of course Mario foils his plans. He also seems to be kind of clumsy in the RPG games. However in Mario & Luigi: Bowser's Inside Story he seems to be stronger, although still clumsy.