Bad IV 5*s

Elincia still works even with bad IV, since her attack is high enough to salvage the situation. Lilina is not really worth investing with this spread and since she has nothing good to inherit, I suggest promoting a better IV 4* Lilina and then merge them (I wouldn't give it a high priority tho). Nephenee still works great with fury and the rest of her base kit. Olivia could become a decent nuke with Iceberg while keeping her A skill. Just be careful with baiting faster mages.

You could also put a skill like GTomebreaker on P!Olivia and probably bait and kill any green mages not running raventome. I have -SPD P!Olivia and will probably load her up with a few different tomebreaker skills + Moonbow for a guaranteed kill. Waiting to see if I get another one with better IV's first.

Elicinia should be fine. Even if she likes speed more than most brave weapon users, it IS still a brave build and Speed is the usual bane for those. P!Olivia you could probably do fine with too, a dancer is still a dancer after all, and she does that job better than most. If you want her performing more for combat than dancing you could possibly put cancel affinity on her to screw with raven tome users.