Dragon Ninja

"Dragon Ninja" is an Sub Archetype of Ninja monsters. So far, Only 3 of them exist, and were first presented In Order of Chaos with White Dragon Ninja as a TCG exclusive. Later in the Return of the Duelist Set, Blue Dragon Ninja was released (again as a TCG exclusive). And another was released in Abyss Rising, Red Dragon Ninja.

Interestingly Enough, only One of the 3 Dragon Ninja's is actually a Dragon Monster, Being White Dragon Ninja. Blue Dragon Ninja is a Sea Serpent, and Red Dragon Ninja is a Winged Beast.

Also, Red Dragon Ninja is the Only Dragon Ninja that cannot be summoned by the effect of Ninjitsu Art of Super-Transformation, as he is a Winged Beast

Trivia

 * Ninjitsu Art of Shadow Sealing features both Blue Dragon Ninja and White Dragon Ninja.