For example, I am so being a magical girl, as one of their best ever skills is to have multiple random spells or actions that they can preform which can either aid players or themselves, or put them at a disadvantage, and that is simply one skill. The more random spells you have, the higher the skill is. 

For example, I have 100 random spells, 50 which can help my character and players either by giving everyone stat ups, dealing great damage to monsters, giving monsters stat effects, etc, etc, there are many ways which they can aid or deal damage.

50 which can greatly put others in danger, either by giving enemies stat ups, lowering themselves or allies stats greatly, give themselves or allies stat effects, rebounding any spell they or allies cast, etc. Again, many ways which they are able to put themselves in a disadvantage. It can be a amazing skill, while also being a really bad skill. They of course can and will have other skills which will greatly help them and allies.