Gekai (All Kingdoms)
If you are lucky you may find (and convice) Gekai in one of your castles if you Search in Domestic Mode. You also may capture him in case an enemy general was quicker in finding him.
He, like any general who commands Samurai troops is best when confronted by dragon armies.
Profession: Samurai
Start Troops: Samurais 
Magic:  Sonic Boom
 Cross Flash
 Sonic Blast
Formation: Surround
Intelligence: < 64
For a picture of the PS2 version move your mouse over the image!