Bowser
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Bowser is Mario's archnemesis by far. He is the leader and most powerful of the Koopa race. Although Bowser has joined forces with Mario in a few games, he is considered an antagonist due to his ambition to kidnap Princess Peach and conquer the Mushroom Kingdom.
Koopalings
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The Koopalings (occasionally called Koopa Kids in the cartoons, not to be confused with the actual Koopa Kids) are the children of King Bowser Koopa. This makes all of them the the heirs of the Koopa Kingdom. Oftentimes, the Koopalings act as high-ranking leaders of the Koopa Troop and mostly appear as bosses in the various Mario series games.
Roy Koopa
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Roy Koopa is a character in the Mario series who first appeared in the NES video game Super Mario Bros. 3& the SNES game Super Mario World. He is one of Bowser's 7 children, otherwise reffered to as the Koopalings. He is the 5th Koopaling Mario will encounter in both games.
Larry Koopa
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Larry Koopa is one of the eaght Koopalings, and is also the youngest of them. The Koopalings are Bowser's children that provide a powerful elite force for him. His first game is Super Mario Bros. 3 for the NES. He has a fondness for bowling and tennis.
Larry's most reconized for his blue mowhawk which he actually combs unlike his brother Ludwig.
Lemmy Koopa
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Lemmy Koopa is one of Bowser's children, a Koopaling. Lemmy Koopa is the clown of the family. He likes to play tricks, despite his size.
Ludwig Von Koopa
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Ludwig von Koopa is the boss of the seventh world in Super Mario Bros. 3 and Bowser's second-in-command. This Koopa resembles real-world famous composer and pianist, Ludwig Von Beethoven and has the power to shake the ground and throw fire blasts from his wand. He is the oldest of the Koopa siblings and also makes an appearance in Super Mario World as the boss of the Twin Bridges Area. He has also appeared as the main villain in a choose-your-adventure book where he kidnaps Peach and guards him against the Mario Bros.
A few years later he appeared in the SNES video game Yoshi's Safari as a boss enemy, and in the GBA game Mario & Luigi: Superstar Saga.
Wendy O. Koopa
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Wendy O. Koopa is the only female child of Bowser. She was the third boss in Super Mario Bros. 3 and the sixth boss in Super Mario World. She is very bratty, and is quick to anger. In the cartoons, she was known as Kootie Pie. Every Koopaling was given a different name in the cartoons. Her most recent appereance was in Mario & Luigi: Superstar Saga as she was the sixth mini boss in the last level of the game.
Morton Koopa Jr.
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Morton Koopa Jr. is one of eaght of Bowser's sons in the Mario Series. His first appearance was in Super Mario Bros. 3 where he appeared as the second Koopaling to be fought. He later appeared in Super Mario World, Yoshi's Safari, and then Mario & Luigi: Partners in Time. In Super Mario World, he attacked by climbing up the walls, then he walked on the ceiling, and then, he fell on the floor, temporaraly making you unable to move. When defeated, he sank into the background and disappeared in a cloud of dust.
Iggy Koopa
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Iggy Koopa is one of the eight children of Bowser, of which, he is the fourth oldest; Iggy is depicted as a mechanical genius, who is also demented and is generally portrayed as having a rainbow mohawk and glasses with swirls on them.