August and Irene take this around low, maybe mid diff depending on how they go about this.
Honestly, the only real threat here is Suzaku due to him mainly being a melee fighter, but I don't see him beating both Irene and August who are a very deadly duo who likely complements each other.
For one, Irene has the ability to make August even more powerful than he already is by enchanting him as she did with Neinhart, boosting his MP by a bit, she may even be able to do something similar to herself, boosting stats (not sure if she can, but it's a possibility).
Let's break this down.
Irene hard counters both Misaki and Haku, making them pretty much nonfactors here. I'm sure that both Irene and August could easily override her BD by powering up. Irene replicating the Scarlet Dimension and August simply negating it and using it on Misaki herself, giving her hours worth of extreme damage taking her out in a matter of moments while Irene handily deals with Haku. So those two are out of the game relatively quickly leaving Kirin and Suzaku.
As for Kirin, it's safe to assume that August can simply negate/counter his magic, copy it, and use it himself, Kirin won't be able to hurt him while August can use his very wide variety of magic (now including Haku, Misaki's, & Kirin's own) against him.
August, via copying Haku's magic can turn Suzaku into a plushie or he can use BD and restrict Suzaku's movements and use his wide variety of magic, that now includes all three of his allies magic against him.
Irene meanwhile is a High Enchantress with 400+ years worth of knowledge and experience, she's no joke and would be a serious threat as well, especially if she stays back and spams enchantments while August handles the main fighting.
I don't see anyone besides Acnologia, Igneel, or the six DG's being able to defeat these two at the same time. They're both just so broken and OP that it's hard to even contend.
People still believe Haku = Suzaku when he lost to Wendy while Suzaku stalemated Natsu while nerfed.
It's because he is. Both Haku and Suzaku have the same MP level, they are equal in the MP department but Suzaku murders him with pure stats while Haku can murder Suzaku via hax.
