A slot on performing azura?

i have the same IV's that you have on your P.Azura and I must say that I did have that same dilemma that you are having right now. What I thought of was that, she won't be in any team to fight every unit. I have the other members of the team for that. In that case, I gave her Triangle adept so as to deal with blues(much better) not that fury won't help deal with them either. That way, i gave her two purposes in my team. First, is to deal or to tank a blue hit from the enemy. Second, is to sing a unit in my team. With that said, the more imposing question is "What team members should you partner up with her? Blade tomes(since Azura is green- I'd pick linde or delthea and then tharja/celica etc.), brave users and tanky units like hector, bk, zeph,effic, etc.
With that said, I can give you the team that i use at the moment along with her. (never lost in arena with this team)
P. Azura(obviously)
Brave Lucina
Bridal Cordelia
Eirika

-in this team, I have P. Azura there to just kill blue units(and she usually just sings in the team. Barely even kills blues let alone other units)
-You can place her in a lot of different team. I have her in bladetome teams, sp grinding teams, cavalry teams, armor teams, flier teams.

P!Azura is a perfect Reinhardt counter. I personally think that to help her with that task of killing Rein, giving her distant counter is the way to go. This allows you to bait Rein, take minimal damage and then hit him back and kill him.

Definitely TA, she can hardly even survive blue physical hits without TA, let alone trying to fight greens with Fury.

Distant Counter + Emerald Axe+ can also be a good option for dealing with Reinhardt and other blue mages.
Without Emerald Axe or TA she actually dies to most variants of QP!Moonbow Reinhardt, especially with a HP bane.

Hope this helps.