Felicity stuns too I think. One thing I hate is her defensive spell, blade dancer, actually makes a unit more vulnerable if broken. If you don't have high speed on her, don't ever put her on defense.
Roalds shield which also heals is so nice. Against focus type enemies, felicities dagger attack can be nice. You can equip felicity with andriod armor and stuff which can give her more then enough HP.
Against healing enemies felicity can be really nice. Or enemies you need to punch through their defenses fast.