Each appears identical to his brethren-a masked samurai warrior in full regalia.
If an Ochimo is slain, any spirits captured by the Ochimo and not yet presented to the Opawang are restored to their original state. The armor of the ghostly samurai falls to the ground with its weapons. The spirit of the Ochimo can be seen briefly as a black tiger-shaped form as it flees this plane.
Diplomacy, Gather Information, Hide, Intimidate, Listen, Move Silently, Ride, Sense Motive, Spot ? Dunno, they seem like they might be sent on diplomatic type missions, hence the Cha skills. They also seem sneaky despite the armor, somehow. Do you have any better ideas?
Ride-by Attack, either Two-weapon Defense or Ability Focus (spirit capture gaze) depending on how tough we want that to be for the CR.
The rest is good. For 2-4 in organization, do you mean the different types of Ochimo? Are there more than one of each type?