maybe you find something useful in this post.. but it's a lot work.
http://forums.kc-mm.com/index.php?topic=25005.0

But do you know if there is something like the stage switcher to interchange the characters?

I dunno about character rels but you can do stage rels with the Stage Switcher for PAL (don't know how I got it, maybe google helps). But this online converter should work too. http://www.lakora.us/rel/
(next time: look into the resources!)
here are the normal rels if you need them: http://www.mediafire.com/?obemxmzbcvb6d
(you could find them in the rescources, too!)

Thank you very much! I've just found them in the resources jaja

If somebody knows how to convert characters .rel to the PAL version, please, tell me about it.

Hi, I´m a PAL user and I was searching for some stages and characters here but my Wii freezes when I try to put them. I supposed it's because the .rel's are NTSC or another region and I should have the PAL ones. However, I've been searching for them and all the links are invalid. Can someone give me the links please? 

The BbS team is at 95% since a lot of time. When do you think they will be ready to be released? Vanitas looks like pretty good, do you think he will be to download this week?

When are you going to put the Vanitas preview? It looks like very awesome!