About the "Characters" and "Guild/clan" form in profile (necessary fields):
--The "Characters" in profile options is a necessary field to fill (and with right information).
Its there of 3 reasons:
1: Easier to know who you are, if your username differs much from your ingamename.
2: Easier for groupmoderators to put you in right group.
3: Easier for all forumusers to contact you in game.
-- The "Guild/Clan" is to help when anyone from another guild is joining our forum.
If those fields isnt correctly filled, it can happen that the forumaccount end up deleted.