Good question on the base color, Falcon: I'm fine with them the way they are since they all look similar enough that we can tell they're all magical girls, but different enough to really reflect the different places they come from. I'm open to any movements for more consistency, though, as well.
I know Ankita will come into this already knowing how to fight, but I think it will be more realistic for the most part for them to get most of their fighting skills as part of their powers, aside from maybe interests they've pursued on their own. As for ages, I'm fine with them being in the same school level, but different grades as long as they're roughly 14-17/18. Personally, I'd prefer around 16-18, but I'm not laying the law down on anything. If your character is going to deal with issues of sex or sexuality, though, I think I'd be more comfortable with 16-18. Ankita is going to be about 16 for that reason. As players we're all 21 and over, but I wouldn't be comfortable with the characters being very young.
And now what I'd like for us to talk about next: Who are our bad guys? What's their plan? And what structure are they going to occur in? For instance, will we have minor and major bosses, waves of drones, monster of the week, a combo of any/all of those? I think the only thing I'd like to avoid is pegging the enemy as one particular culture; I think it would be really neat to pull from mythological and cryptozoological creatures, and I can pull a wiki page or few if you guys want some examples.