In terms of fighting Azure (I'm Scarlet):
Usually I beat Azures with strategy, but I'm most frustrated in two situations:
1. When the Azure uses that shark bomb move and probably has all level 5 ninjutsu magatama behind it. It's an AOE attack and a really good one at that; sometimes AOE's - like Ninja War Kiba's, for example - hit more than one opponent but focus on one, whereas in my experience Azure's Shark Bomb... is the bomb.
2. When the Azure has a team consisting of all medics. The Azure's pa$sive can still be the quick heal while also having a mystery attack. Then Kurenai guards, Sakura megaheals, Shizune poisons, and I die.
As for neurotoxin, I forget what that does... if it's poison I personally would pick something else since a) I don't think poisons stack, b) it doesn't seem to do much, c) my debuff-clearing pa$sive + Kabuto's constant double heal take care of it.