Bowser

"'GWAHAHA! Great dark hurricane! Seriously, perfect backdrop for an awesome final battle! You really sweat the details! Listen up! You're saying the kingdom will vanish? NOT TODAY! THIS KINGDOM IS ALL MINE! SO YOU VANISH!' - Bowser to Dark Bowser in Mario & Luigi: Bowser's Inside Story"Bowser, sometimes known as King Koopa (Japanese: 大魔王クッパ, Daimaō Kuppa, which translates into "Great Demon King Koopa" or "Great Sorcerer King Koopa", the latter being used in the manual of Super Mario Bros.), is a major character and the main antagonist of the Mario franchise. He is a large, powerful, fire-breathing Koopa who leads the Koopa Troop, an antagonistic organization of turtle-like creatures, and has been the archenemy of the Mario Bros. since his debut in the first Super Mario Bros. He has repeatedly kidnapped or attempted to kidnap Princess Peach with the ultimate goal of defeating Mario and taking over the Mushroom Kingdom.

Why He Rules

 * 1) When Bowser was created, he was a typical villain without much personality beyond simply wanting to take over the Mushroom Kingdom. Later games started showing various different aspects of Bowser's character, depending on the nature of the plot. While his platformer role continues to be that of a simple antagonist, his Mario Party antics typically depict him being more angry, childish, and mischievous than dangerous, and his portrayals in the RPGs range from a threatening, yet humorous villain, to a playable anti-hero. Even when Bowser is acting as a protagonist in a game, however, he continues to insist he is an evil character, and his reasons for helping the protagonists are typically his own selfishness. In some games, he even breaks the fourth wall.
 * 2) He's not just some "rawrgle blargle" fire-breathing monster. He's got style. His evil lair can be a stereotypical dark castle surrounded by lava in one game to a coney island disco palace or a brightly lit amusement park in the next. In Super Mario Odyssey, he attempts to get himself and the princess married, and he dresses for the occasion. The shoes are even plated with metal so his claws out don't poke out of it, same goes for his golfing attire in Mario Golf: Super Rush. That's clever designing. The Koopa King's showmanship is what makes him one of the most memorable villains in videogame history.
 * 3) His famous rivalry with Mario is an iconic case of a hero-vs.-villain trope. And an entertaining one at that. In Super Mario Galaxy, he even says that he respects how Mario is always able to put up a fight, and that he chose the right guy to be his arch-enemy.
 * 4) He might act tough, but Bowser does have a soft side underneath that intimidating shell (pun intended). He's a single father who tries his best raising Bowser Jr., and perhaps giving him a mother may be the reason he always kidnaps the princess in the first place.
 * 5) He has a perfect villainous design for his species, combining standard Koopa elements with those of a fire-breathing dragon.
 * 6) In the crossover game with Sonic a.k.a The Olympic Games, he had a good friendship with Eggman as villains.
 * 7) He shows to the nice to his minions are also nice since he treats them respectfully to them making him a good boss of the Koopas.
 * 8) Scott Burns and Kenny James are awesome at making him sound like the goofy evil beast he is, and Jack Black is sure to give an awesome performance in the upcoming movie.

The Only Bad Quality

 * 1) He can lack common sense with his tactics and behavior at times.