Luigi

From Paper Mario Wiki

Luigi is a character in the Paper Mario series, though until Super Paper Mario he was just took the role as a minor character. In Paper Mario you find him in Mario's Pad. In Paper Mario: The Thousand-Year Door he plays a bigger role, and chronicles his adventure in the Waffle Kingdom to save a princess. Even so, his stories are just for amusement, In Super Paper Mario is finally a playable character, whose special ability was to jump higher than the rest of the party members.

In Super Paper Mario he is captured by Count Bleck and is brainwashed. He assumes the role as Mr. L, one of Count Bleck's highest ranking minions. You first see him in chapter 4-4 when you fight him. He uses Shroom Shakes to regenerate and mostly uses Spring Jump. After you beat him like this he unleashes Brobot to fight. He uses lots of laser attacks and has a tremendous 255 hp, though the way you fight him makes up for it. In chapter 6-1 after the kingdom is destroyed he shows up to take the broken Pure Heart. He uses Brobot L-Type to fight but it has less hp than last time.

He is killed by dimento and you find him in the Underwhere after chapter 6. He joins the group and his special ability is his Spring Jump used to reach high places.

In chapter 8 his final battle is against Dimentio and after he beats him Dimento uses a suicidal attack on him. He is really just taking control of Luigi and Dimento has him fuse with the Chaos Heart and himself to make Super Dimentio