|Prince Niko Koopa Jr.|
|Date of Birth||May 28, 1998|
|Aliases / Nicknames||Niko, Niko Jr.|
|Main Weapon(s)||Dark wand, Dark Star|
|Vulnerable to||Light Star|
|Relative(s)||Abel R. Koopa (brother), Aiva O. Koopa (friend), Aidan T. Koopa (brother)|
|“Shut up, Lemmy”|
|—Niko Koopa Jr. talking to Lemmy Koopa|
Niko Koopa Jr. is the most mature of the koopalings. He's older than most of his siblings and cousins. He was named after his dad, Niko Koopa Sr. He was Jessica Koopa and Niko Sr.'s favorite son, but Niko Jr.'s parents died, so he had to live with Bowser. He sometimes helps Mario on his adventures.
Super Mario Bros. 3
Niko Jr. apparently is on Mario's side.
Super Mario World
Niko Jr. is the second one fought.
Mario is Missing
He doesn't appear in the game, but gets mentioned by Nolan C. Koopa
He isn't mentioned nor seen in the game.
- His notable color is dark blue.