The Ninja theme was a short lived subtheme of Castle, that ran from 1998 to 2000. The sets of the theme were based around the Samurai and Ninja of feudal Japan. In 2009, they appeared in 4850307 LEGO Battles, as an ally of the Imperials, and the enemy of both Pirates and Islanders. A ninja minifigure was also released in 8683 Minifigures Series 1 in 2010. It was succeeded by Ninjago in 2011.
The Ninja line relocated the classic Castle Theme to ancient Japan, where graceful Oriental architecture provided the backdrop for an eternal struggle between two factions of daring and masterful martial artists. Interesting new elements for the Ninja line include samurai helmets and armour, ninja hoods, katana swords, and precious faceted jewels. The Shogun Gi-Dan and his ally Ito, the grey ninja, defended a trove of mystical rubies from the Bandit Chief Kendo, his band of robbers, and the black ninja Bonsai, will stop at nothing to possess the ancient treasure.
Four Ninja mini-sets were available around this same time. They were each sold under more than one stock number, and the only set to be named was the small catapult wagon 1099 Ninja Blaster, which also used the numbers 1184 and 3016. The other three sets included a ninja raft 1185/3017, a sword cart 1186/3018, and a bat-winged hang glider 1187/3019, each with a Ninja minifigure.
In 1999, the action shifted, as the jewels were captured by the evil Emperor and secreted within his fortress-like palace. The white ninja princess appears, and with the aid of her army of flying red ninjas, attempt to overthrow the Emperor and rescue the dazzling treasure. The Emperor had at least one ship to use.
Four (circa) 1999 Ninja mini-sets were available, sold as promotions from Kabaya, a Japanese candy company. This the sets in this group had two different stock numbers.
- 3074 Red Ninja's Dragon Glider
- 3075 Ninja Master's Boat
- 3076 White Ninja's Attack Cart
- 3077 Ninja Shogun's Small Fort
Three small Ninja sets were available from Shop At Home in early 2000. These were the only sets to include a pair of green Ninja warriors:
List of Sets/Merchandise
- 1099 Ninja Blaster - Minifigures: Green Ninja Robber
- 1184 Ninja Blaster -Minifigures: Green Ninja Robber
- 1185 Mini River Ninja - Minifigures: Bonsai
- 1186 Mini Siege-Cart Ninja - Minifigures: Blue Ninja Shogun
- 1187 Glider - Minifigures: Ito
- 1269 White Ninja - Minifigures: White Ninja Princess
- 3016 Ninja Blaster - Minifigures: Green Ninja Robber
- 3017 Mini River Ninja - Minifigures: Bonsai
- 3018 Mini Siege-Cart Ninja - Minifigures: Blue Ninja Shogun
- 3019 Gray Ninja - Minifigures: Ito
- 3050 Shanghai Surprise - Minifigures: 2 Red Ninjas, White Ninja Shogun
- 3051 Blaze Attack - Minifigures: 2 Red Ninjas
- 3052 Ninja's Fire Fortress - Minifigures: 2 Red Ninjas, Ninja Master
- 3053 Emperor's Stronghold - Minifigures: White Ninja Princess, White Ninja Shogun, 2 Red Ninjas
- 4805 Ninja Knights - Minifigures: Blue Samurai 2, Blue Ninja Shogun, Ito, Bonsai, Green Ninja Robber.
- 6013 Samurai Swordsman - Minifigures: Blue Ninja Shogun
- 6033 Treasure Transport - Minifigures: Ito, Green Ninja Robber, Brown Ninja Robber
- 6045 Ninja Surprise - Minifigures: Bonsai, Green Ninja Robber, Brown Ninja Robber
- 6083 Samurai Stronghold - Minifigures: Bonsai, Blue Ninja Shogun, Blue Samurai 2
- 6088 Robber's Retreat - Minifigures: Bonsai (x2), Green Ninja Robber, Blue Samurai 2
- 6089 Stone Tower Bridge - Minifigures: Bonsai, Ito, Blue Ninja Shogun, Green Ninja Robber, Blue Samurai 2
- 6093 Flying Ninja Fortress - Minifigures: Bonsai, Ito, Brown Ninja Robber, Blue Samurai 1, Blue Samurai 2 (x2), Blue Ninja Shogun, Pirate Skeleton
- 3344 Ninja 1 - Minifigures: Red Ninja Shogun
- 3345 Black Ninja and 2 Robbers - Minifigures: Bonsai, Red Samurai 1, Red Samurai 2
- 3346 Green Ninja & Samurai Lord - Minifigures: White Ninja Shogun (without armour), Green Ninja, Green Ninja Princess
- 3074 Red Ninja's Dragon Glider - Minifigures: Red Ninja
- 3075 Ninja Master's Boat - Minifigures: Red Ninja Master
- 3076 White Ninja's Attack Cart - Minifigures: White Ninja Princess
- 3077 Ninja Shogun's Small Fort - Minifigures: White Ninja Shogun
- 4229645 Memo Pad Minifig - (X) Ninja Red (2003)