there were couple server merges, and Brekt having loot rules akin to FV was merged into Firiona Vie. not a bug, just a merge. You should find your chars there.
Three possibilities on the lost characters: You have more characters than character slots. Then some of the least played characters will be unavailable until you delete other characters to make space, or buy more character slots if you can. The Merge ate the character. Possible, but unlikely. login server glitch and they are there and you will see it next time you log in. if you think it's 2 send a petition and they will look into restoring it. If you think it is 1, you can send a petition to ask, but they can't do anything about it. You either buy more character slots, or delete a character. But they can at least tell you before you start deleting that that is the issue. 3 is random and will resolve itself.
sorry for the double post. I didn't see the update. Thank you Ngreth; I've actually met you in game on Beta once. Beriberi