[@FickleSickle]
So, if you're doing it here in the tabletop section, the real question that needs to be asked is what system you intend to use?  While you've linked the unofficial RWBY RPG system, I may have something a little more solid of a system to recommend: Big Eyes Small Mouth ([url=http://www.drivethrurpg.com/product/24482/BESM-Big-Eyes-Small-Mouth-3rd-Edition?it=1]3rd edition[/url]). For those who do not know of this wonderful little system, BESM is an anime-styled general system that allows for a great deal of flexibility and customization.  This is especially vital when it comes to the nature of the weapons and magic that appears in the series.  Building most of the characters in the series would be doable with BESM while still maintaining its balance (as long as attribute benchmarks are observed, otherwise you get someone dealing out 50+ damage per hit when the baddies only have 20-ish HP)

Just food for thought.