The poster is right that there are more Origin characters out there apart from the additional ones we all know of (Helia, Minsc, Karlach). Note that most of them appear unused, outdated, or dropped. Some of these are: The Kid, Sylvira, Red Wizard, and Jacc Devir.
However, I can't see any references to Adbel Adrian's kid. There are some code blocks about "TheKid", as Chubblot said, but it doesn't point to Abdel's child.
