YAMI

From Sheapedia

YAMI seems to have originated from The Hooded, and seem to have an aim on destroying it.

YAMI's operatives

The current operatives known are named Buki and Dark, with Dark being the leader. All others have not been seen outside their headquarters.

Connection from The Hooded

YAMI's operatives seem to have been PROJECTs, each calling themselves PROJECT: <name> when introducing themselves. The only person to not follow that rule was Dark; she just stated her name was Dark. They were experimented on for genetic engineering while they were in The Hooded, but became hostile, escaped, and had the PROJECTs discontinued.