Yagyu Clan

The Yagyu Ninja (also known as the Yagyu Clan) was a Clan of bat-like Mobian ninjas who were infamous for plundering and terrorizing villages in the Dragon Kingdom. For over fifty years, the Yagyu Ninja attacked and pillaged goods from Leung Kar village, often stealing things from the Temple of the Golden Lotus. However, in 3236 the Yagyu were stopped from stealing goods by Monkey Khan. Khan, along with Liu Fang and Liu Chi Me later tracked down the Yagyu to their headquarters and attacked them, though subsequently fell into a trap set up by Lord Yagyu. Khan and the others discovered the loot stolen by the clan, only to be attacked by a robot dragon controlled by them. Monkey Khan managed to reprogram the dragon to attack the clan members, forcing them to flee. A year afterward, the Clan Wars involving the Yagyu Clan were ended when the Iron Queen slew their leader, the Bride of Rich Nights, and made them her soldiers.

Terrorizing and Stealing
For generations the Yagyu Clan terrorized and robbed treasures from Leiling Kar temples. They would stash their stolen treasure in an underground lair near their Haunted Lake base. The treasure was guarded by a "dragon," a giant green robot that is attracted to gold. During one of their temple raids, two mobians, Liu Fang and Liu Chi Mei chased after two ninjas until Monkey Khan engaged the ninjas. The Yagyu members used smoke as a distraction while they escaped. Monkey Khan, Liu Fang, and Liu Chi Mei traveled to their hideout where they were ambushed by many Yagyu ninja. The leader of the group, Lord Yagyu, dropped the trio into the treasure room, where the robot dragon began to attack them. The dragon only focused on Monkey Khan because of his gold Power Ring headband, but Monkey Khan damaged the robot. The robot began chasing the Yagyu Ninja away while the trio recovered the treasure. (SSS: #8)

Servants of the Iron Queen
It is unknown what happened to Lord Yagyu but the rest of the clan followed the Bride of the Rich Nights during the Clan Wars. The Iron Queen killed the Bride of Rich Nights and took the Yagyu as her own. The remaining clans also started following the Iron Queen. The Yagyu Clan accompanied The Iron Queen, the Iron King and the Bride of Conquering Storm to New Megaopolis where Snively, Dr. Eggman's "nephew," declared the Iron Queen the new ruler of the Eggman Empire. They searched with Conquering Storm through the ruined city but only found the Eggdome operational. (StH: #200, #201)

When Sonic the Hedgehog and Monkey Khan ambushed the city, the Yagyu Clan was ordered by the Dark Egg Legion's Kommisar, Lien-Da to fight them off while they stayed in a safer position as support. (StH: #202)