Quote Originally Posted by 'Stormweasel',index.php?page=Thread&postID=171828# post171828
Signatures are "account-bound" as far as I'm aware so you can't have more than one toon per account signing the same charter

Unless that's changed since the couple of last months I last tried to get a guild sorted.
This is still the case, if you try to sign a guild charter with a second character on the same account, you get a message to the effect that "you've already signed the charter."