Hi there SMD! I'm really surprised about your message! Those sprites were done ages ago, never thought someone would actually use them.
I have to warn you they don't animate prefectly. I wasn't really very skilled back then.
You're are free to use them, yes. I praise you for even asking. Just don't credit me on that Rouge attempt, since I am not very fond of splices.
Still, I'm curious to see what you are doing, so please keep me updated, and show me that Rouge when she's done.
Good luck on your project