The character(s) described on this page no longer appears, due to death, leaving, or being secluded from the other characters.
Unless the character is permanently dead, there may be a chance that they could return, but it is unlikely and if they do return, it is very likely that they could be limited to being either a story-exclusive character or a minor character.
The Guardians of Umlaut are, as their name suggests, the three people in charge of protecting Umlaut from invaders. Their names are Invokus, Venusia and Aurum. They were killed by the gang in Stare into the Dragon Soul.