Gilgamesh Wulfenbach/Mad

Gil's Mother
It is assumed that Gil's mother is the  to whom Klaus refers only once in the first eight volumes. One popular theory is that Gil's mother is Zantabraxus, Warrior Queen of Skifander. See below.

Skifander Connection
It is widely suspected that Lucrezia sent Klaus to Skifander 22 years ago. This would explain why Klaus can speak Skif.

Wherever Klaus was for those 4-5 years was Gil's birthplace. Further, Klaus thinks that a green-haired woman who speaks Skif, that is, some one from Skifander, would have reason to kill Gil. .

Baron Wulfenbach's statement that he "kept [Gil] alive" hints at the old story that Amazons (to whom the tribeswomen of Skifander bear more than a passing resemblance) kill all of their male children. Whether this is accurate, of course, would be known only to Zeetha, to whom the question has not yet been put.

Relationship to Zeetha
It is speculated that the Chump of whom Zeetha is a daughter could be Klaus Wulfenbach, which would make Gil her brother. This may be foreshadowing of that possibility or merely the Foglios teasing us.

Gilamonster
If Klaus has altered Gil to make him respond to, is Gil already a construct? Given that Gil has been partaking of Battle-Draught, will he become a Jägermonster?