Castor Kane was Neverborn. In his case it was because his mother was the unfortunate victim of temporal paradox and wound up dying at the age of five. Castor himself should never be, but he was under the protection of the Puissant Purple Mage Band and Slightly Racey To Your Mum Revue. This travelling band of mystics and entertainers have kept Castor shrouded in enchantments. Someday though he'll want his true name the one he lost in his life's unmaking. When that happens he'll die/not die instantly then be removed from the universe, but the Purple Mage also said that in that moment he'll know the Truth.
This was something you needed to know.