Guy Passive should be: While Guy is under Ignition, he is immune to enemy Ninjutsu and Taijutsu damage.

So, basically while under ignition guy can only kill himself with mystery or at the end of round from ignition/poison damage. Or friendly fire, like teammate under chaos causing damage.

Obito: Attack should cause Knockdown. With a chase that causes remove buffs/shields or reduces mystery or removes immunity, a character's standard attack should not trigger that chase. It should require a second ninja to be alive to chain to the chase.