In this game you're the matchmaker here, pair up the character above you with their soul mate! or just someone who it'd be hilarious to see them with. xD
Xion and Axel wouldn't work since Axel is more of a big brother to Roxas and Xion, unless you mean he's suddenly going to become a pedo and screw his sister LOL INCEST then no. It wouldn't work. Ever.