Warbanner of Defense will rock, but I agree, it should limit to lower than 40/35, and that won't be a spiker killer because we have peircing.
Kame, I think needs a boost to his first skill... How about it doing 10 damage or 5 with the stun?
Akira needs a boost at her damage better than the cooldown, this will make her OP with sainan. She, yuki and asami already was a pain with that "forever stun" tactic, now it will only grows. In my opinion.
FotF - DON'T xD 20 aff damage with a 1 turn cooldown for no cost? Could it at least no by pass ivulnerability? This would make it easier to figth against. What about that nerf?
Piercing damage, you say. Jun, Sasori, Megami, and Jatai. Damn, that's a lot of piercing damage, don't you think?
On Akira, you forget that this was back in beta, where as stated multiple times, was a much harder time. With new characters and much better items than before, there really should be no fear of that team.