Jr. Troopa (or Master Jr. Troopa, as he calls himself) is a young Koopa who never left his egg after he was born. He is a bully that lives near Goomba Village who likes to pick on other kids. Jr. Troopa has his own piece of territory which he likes to call "Jr. Troopa's Playground". Throughout the game, Jr. Troopa trails Mario and his allies during their quest to save the Star Spirits from the clutches of the Koopa Troop. After each defeat, Jr. Troopa returns in a stronger form. In the last fight between Mario's party and Jr. Troopa (in Bowser's Castle), the young Koopa switches between all of his previous abilities.
Early in the game, Mario and Goompa travel to Jr. Troopa's playground to find the Goomba's missing Hammer and Goombaria's dolly. Eventually, they find the Hammer and her doll and head back to Goomba Village. However, Jr. Troopa discovers Mario and Goompa are in his territory and challenges Mario to a fight. Mario defeats the Koopa, and then heads on his way. After Mario saves the first Star Spirit from the Koopa Bros., Jr. Troopa ambushes him on his way back to Toad Town. During this fight, Jr. Troopa hides in his shell, raising his defense. However, Mario once again beats the young Koopa.
Jr. Troopa next appears in Forever Forest. He is lost and scared, so at first he is "glad" to see Mario, but he remembers that Mario is his enemy and Jr. Troopa attacks. Jr. Troopa's new ability is flight. Nevertheless, Mario beats Jr. Troopa, again.
Still chasing Mario, Jr. tracks Mario to Lavalava Island, swimming all the way across the ocean. However, just as Jr. Troopa arrives, Mario leaves on the back of a Whale, forcing Jr. Troopa to turn around and swim back across the ocean, instead of flying. Jr. Troopa arrives at the harbor in Toad Town and challenges Mario. This time, Jr. Troopa has placed a spike on top of his head to go with his wings. However, all the swimming had lowered Jr. Troopa's HP to twenty.
Jr. Troopa appears once again in Shiver Snowfield, though Mario can learn from the penguins that they were talking about him making a ruckus. Jr. has learned some magic and uses a wand-like stick to create balls of damaging magic. After Mario defeats him, he gets frozen in a block of ice before he has time to recover.
Jr. Troopa makes his final appearance in Bowser's Castle. Jr. Troopa appears just as Mario is preparing to face the Super Ultra Mighty Koopa Bros. the Great. He beats the Koopa Bros. himself and proceeds to challenge Mario. After Mario defeats him, Jr. Troopa then runs away shouting that he will never give up.
Paper Mario: The Thousand-Year Door
Jr. Troopa also makes an appearance in the Paper Mario arcs of Super Mario-Kun. He plays the same role as he does in the game: he interferes with Mario and his partners' progress. As in the games, he uses various power-ups to aid him in the fight, but in the end, he is always defeated.
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