There was a bit of a discussion in the Interest Check on whether or not Sakura would be an appropriate character to use in this kind of setting. Ultimately, it's up to the GM to decide whether or not she would fit this universe. If she doesn't, then I'll either work on making a few tweeks to justify her being there, and if she just doesn't have a good place in this RP, I'll choose someone else.
It's also a good point that she probably shouldn't have all of her cards. It would probably be a good idea to give her a limited number of cards for the purpose of this RP. For example, I honestly wouldn't use The Time card because that'd be way too OP.