cubsfan6506
Got u
Nevermind...
I could really see which one is the unit you already have so I'll just post the links for them.
Korean Knight (Not Japanese, but look similar enoguh)
http://forums.civfanatics.com/showthread.php?t=163132
Kunichi (I figure this should be the actual invisable unit, while Ninja should be neutral and buff up a bit)
http://forums.civfanatics.com/showthread.php?t=143340
Chinese Spearman(I think this should be one of the peasant units, looks a lot more realistic than the original ashigaru)
http://forums.civfanatics.com/showthread.php?t=42446
Female Samurai
http://forums.civfanatics.com/showthread.php?t=161135
Noble Archer(Looks like one of those noble court archers)
http://forums.civfanatics.com/showthread.php?t=150046
Rocket Team(More bombarding unit)
http://forums.civfanatics.com/showthread.php?t=175214
Samurai Flintlock(Its a bit more advance form of flintlock...might be a bit out of time period though)
http://forums.civfanatics.com/showthread.php?t=174626
The meat of the unit Samurai pack 5 of them too
http://forums.civfanatics.com/showthread.php?t=63269
A bit more Samurai Unit
http://forums.civfanatics.com/showthread.php?t=71835
well anyway...hope you can find some uses for them