The physics of that bow bother me, assuming it actually curves. The shorter lines would cause the bow to curve pretty quickly, which would take all the tension out of the longer lines. It just doesn't work.
You are all wrong! That bow doesn't actually fire any arrows. When she pulls on the core of the bow, the core plays (acts like a finger) and vibrates the strings slightly like a guitar. In turn creating an elemental sonic wave. No need to reload or waste arrows and keeping with FF logic. The arrow at the tip is an amplifier crystal to keep the basic construct of a bow.
Hands down the most cunning villain of them all - Caius. Didn't really like Serah that much in FFXIII, but grew to like her in FXIII-2. Looking great in that costume, and Noel was actually a very likeable character. Too bad there was no love between them...or was there???