Larry Koopa

Larry Koopa is the youngest of the seven Koopalings, Bowser's kids. He appears as a boss in many Mario games. He also appears in two Mario cartoons where he is known as Cheatsy Koopa. And also in a Japan exclusive Mario anime series where he goes by his real name.

Super Mario Bros. 3
His first appearance was in Super Mario Bros. 3, as the first boss. Larry is fought in an airship at Grass Land. He uses magic attacks. Mario defeated him, and he retreated, leaving behind the magic wand needed to change the king of Grass Land back to normal.

Super Mario World
Larry is the seventh Koopaling fought in Super Mario World, and is fought at the Valley of Bowser right before Bowser's castle. To defeat him, Mario knocked him into the lava.

Mario & Luigi: Superstar Saga
Larry, along with the other Koopalings, were apparently revived somehow, as they returned in Mario & Luigi: Superstar Saga, as bosses in Bowser's castle. Larry was the last Koopaling to be fought. They were all apparently killed after being defeated.

Super Princess Peach
Although not actually seen in the game it was revealed that Larry along with his other siblings (excluding Bowser Jr.) were to make an appearence in this game but were taken out for no apparent reason. Every one of the Koopalings had their own complete sprite sheet.

New Super Mario Bros. Wii
The Koopalings returned again in New Super Mario Bros. Wii. Larry is fought twice in the first level (a grass level). Kamek made the floor move during the second battle, but Mario defeated him and he fell off the screen. After the credits, it is revealed that he survived, but Bowser, Bowser Jr., and the Koopalings were all crushed when Bowser's castle fell on top of them.

Physical appearance
Larry has blue hair, and is one of the smaller Koopalings. He initially has a green shell, but this is later changed to a blue shell.

Trivia

 * His name is derived from Larry King.