[Sunred]

So here is what I can make out from the scans:

Kousaka Kikyo is from the Ise School of Ninjutsu and teaches children ninja techniques.
Ise Kiroku is Kikyo's teacher and runs a tight ship when it comes to teaching the way of the ninja. And as we can see is set up to be a rival of sorts for Takaharu.

Kyuemon was Yoshitaka's pupil and also studied the Igasaki School of Ninjutsu along with Tsumuji aka Ninja dad.
Here are some highlights noted on one of the scans:

1. As we all know, was a pupil of the Igasaki School of Ninjutsu.

2. Kyuemon knew Tsumuji was not fit to be a ninja, so set him up with 'something'.

3. While looking to break Kibaoni's seal, Kyuemon raided the Igasaki dojo and stole the hammer.

4. After stealing the hammer, it was Kyuemon that revived the Kibaoni army.

5. Later, Kyuemon met Yoshitaka and tried to play mind games with him and shake him up.

6. During the battle with the Ninningers, Kyuemon even tried to invite Kinji/Starninger as a pupil.

7. Kyuemon is looking for the Izayoi School's Core Hagurumas(gears).

8. Tried to give Kinji Yokai powers.

9. Has mustered a personal army. Four henchmen that Kyuemon summons from scrolls are Hayabusa(falcon) the swiftest of the four(and can also make those who are struck by his shurikens go berserk), Kuroari(black ant) who can latch on to others and control them, Ikkakusai(rhinoceros) who determines the fight based on the roll of a ninja dice, Mujina(badger) who can steal the talents of others and also create clones, and finally, Karakuri Kyubi, Kyuemon's otomonin said to be stronger than Shurikenjin.
From the looks of it, the Izayoi School seems like it was very shady to begin with(think the Sith).
Kyuemon also has personal genin from the Izayoi School called Supparage.