AR Armor Emblem

Now as we are approaching the 5th slot for our teams, I was thinking of making it an armor emblem on defense with a choke point for the enemy team that has enemy phase armors in the front (currently L!Hector, Effie) and some player phase armors with armor march etc. in the back (currently L!Tiki and H!Jacob).

I am building a Zephiel right now to add some red color to the team and am not sure which B slot I should go with, any suggestions? Sidenote: I believe he is more relevant to the AR meta than Arden or BK/Zelgius as he can take a good amount of magic damage, which will be much more prevelant than in arena (I don't need him for arena anyways)

General build suggestions also welcome :)