I have to disagree with Evanchild on this one. I think handling characters in multiple guilds X, Y, ... is the source of conflicts.
Either the guilds are allied or friendly, and that should not cause *too many* problems, except decisions in guild X will be biased in favour of the guild Y and vice-versa. In any case, it will not reflect a true, logical decision process. Hence, it\'s not good for the gameplay.
Or the guilds aren\'t allied nor friendly, and this is the high way to gossip, spying and worse. Don\'t tell me a normal person (I mean the player) can handle mutliple characters this way without mixing them.
Anyway I don\'t see the point, better to take the time for one thing rather than spoiling it all over multiple contradictory characters spread over several guilds. That being said, I see no problem if the chars are in the same guild or guildless
Oh and btw, some guilds don\'t accept characters owned by persons who already have in other guilds *hint*