The last time i bothered counting...there where above 150 jp units....
I hope that is enough to explain you why no one is interested...
Though if you dont understand the jp wiki...ask the forum or pick an easy map and try using the unit there...let her attack the enemies and activate the skill to see what she does....
if you have a problem with class perks or any new implemented class of dmm version..try lafte-san's class and army guide...