Oh man where to begin.
When I join an RP I see what is given to me, I read the rules and then make the character with the decided ability that I wanted. NOWHERE in that thread is it stated "Note: Some abilities have been reserved by player from the previous Rp, here is a list and I hope you understand" which YOU DID NOT DO nor did your sister. Do you know what thats called? Disorganized. When you don't do shit like that it misleads the player and their creative idea what they want their character to be like and how can said ability progress the character itself. What's funny is that you don't even know yourself that the player that reserved the power is even going to join, which pretty much shows that you can't even come with an understanding with your fellow players. Is that how you seriously run your rps? "This is how I run the RP and you have to follow what I say"
You might as well say you're a complete ass. If I was in your position I would actually talk to the person with the reserved ability because I DON'T KNOW IF HE'S EVEN JOINING (Which is a stupid argument to even have with someone who actually register because I know said player would be active while uncertain with the other) and I would get back to you if you can have the ability or not. You can't run rps for shit cause you basically run what you just said
I have in fact, and trust me when I say this I know how to actually run an RP because I communicate with my players. You obviously don't, learn from your mistakes and maybe I'll change my opinion about you.