That's actually a really solid Ephraim! +Def is great as it'll turn him into a defensive monster. Keep his A and B skills for sure. You'll probably want to dump his special for Bonfire or Ignis. And I don't have L!Eph myself so I don't know how well this would end up working, but with Solar Brace, he should be healing himself often. That means you could give him Ardent Sacrifice for his assist to turn him into a pseudo-healer. Otherwise just go with Swap or Reposition or some other basic movement assist.
Performing Azura should inherit Wings of Mercy onto her B slot, and keep the rest of her kit. Her special could be Moonbow or Luna.
Innes... he's fantastic but a bit difficult to use. Mine is +Atk -Spd (so possibly the exact same as yours) and I've tried a bunch of strange builds on him but none of them work as well as I'd expect... His base kit is perfect for countering mages and if he does end up being +Atk then that'll help counteract Fortress Res' downside. But no matter what you choose to do with him, Iceberg should almost always be his special.
Also imo Gamepress is okay for getting build ideas, but you really shouldn't commit to using anything the have listed exactly. A lot of builds there require sacrificing rare units which you won't want to do as you just started playing AND you're F2P. Plus most characters there get their page put up when they're released, but then are ignored for months even when a new weapon or skill gets released that would fit them perfectly.
The alternative is Gamepress which is just plain bad for giving build ideas. But the site itself is layed out nicer for checking stats and skills. Asking someone is usually the best way to build a unit since everyone has different IV's and units they could fodder off.
