Nin-Ninja (ニンニンジャ) is the first NIN-type Medarot modeled after a ninja.
Nin-Ninja's design is based on a ninja wearing a dark blue hood. Along with Get Ready, he serves as one of the mascots of Shinobic Park, a ninja-themed amusement park. He mainly fights with his wrist-mounted swords, but can also set traps or create gusts of wind to catch his opponents off guard.
Nin-Ninja's arm parts are named after bladed weapons used by ninjas: a Kunai and a Ninjato (ninja sword).
In the games
Nin-Ninja is a bipedal Medarot with Sword attacks on both arms. In Medarot 1, his head action is a Shooting Trap, but this was changed to a Fighting Trap in Medarot 2 and later games. From Medarot DS onwards, his head action was changed again to Tornado. Nin-Ninja's part names have also changed over time. In Medarot 1, his head part is called "Mist Net" (かすみあみ), while in Medarot 2, R, 4, and 2 Core, it has the name "Stealth Cloak" (かくれみの). In Medarot DS, his head part was renamed "Kamikaze (カミカゼ , or divine wind) to reflect his new Tornado attack, and the rest of his part names are written in katakana script instead of hiragana. Nin-Ninja's parts are compatible with different Medals depending on the game, but his arm and leg parts are frequently compatible with the Kuwagata Medal.
In Medarot 1
In this game, Nin-Ninja is the only male Medarot capable of using Shooting Traps. His parts can be obtained from random battles with ninja Medarotters, or purchased from the souvenir shop at Shinobic Park (head and legs only). Here, his head and leg parts have the Sneak attribute, making him one of the few Medarots compatible with the Ninja Medal. His arm swords have the Fighting attribute and are compatible with the Kuwagata Medal instead.
In Medarot 2
Nin-Ninja's parts are not normally obtainable in Medarot 2, and must be transferred in from Medarot 1. Here, his head part was changed to a Fighting Trap with the Set-up attribute, and the attribute on his legs was changed to Fighting to match his arms.
In Medarot R
Is obtainable from the Part Collection by fighting らっぱ that is ranked opponent number 33.
In Medarot Brave
Quote: Hello, boys and girls! Did you learn how to use traps yet? Come and see me at the Ninja Park!
In Medarot DS
His head Part was renamed as Kamikaze (カミカゼ), and the rest of the parts are now written in katakana instead of hiragana. He now has the series number NIN00-M. Kamikaze uses Tornado technique, which deals double damage if the battlefield is desert.
- KNI-0 Icknite, his female counterpart.