Yeah... You asking for the wrong buffs xD, only buffs Kunoichi's needs is more PvE damage cause the gap between the lowest PvE classes and the top PvE classes is still laughable huge and some sort of rebalancing of AP scaling so Kuno does better damage at lower AP so to not be completely useless before Giga gear or in gear capped content (T1 nodewars, AoA, etc).
I agree that the class does not have a consistent or reliable protection, its iframes are a festival of Dsync and Rng, but the even more necessary is especially for kuno awaken a buff to the damage in pve and add cancellation forms to the spin. Bon skills need a change too, they are very bad