Oooh Ivory, is she good? Saw in wiki she has some kind of drain life so she can heal herself, looks like a pretty good skill compared to other archers.
As for my Vanille, she kinda grew on me even more as it turned out she fires both her pistols at once, doing double her displayed damage. Also she hits instantly, no flying projectiles bullshit, which is great (as Zera for instance quickly fires 5 arrows at an enemy, 4 of which land on an already dead target - aka she does like 1/5 of her potential damage unless shes firing at a boss with lots of health)
On the downside however Vanille has short range for an archer, her range is on par with Heet. Still her instant double shot is great; she's doing quite good damage already at lvl 45