Gareth Callahan:
A savant engineer and inventor, Gareth has amassed immense wealth and political power - he designed and produced several battleships under contract during WWII, for example. However, as a black man in this time, all his work is communicated through his friend and white alias, Harrison Leslie. Gareth is bitter about the state of the world and when he meets Dagan after an adventure of his own in WWII (where he loses a leg to a shark), he is quick to see that Dagan is worth studying and befriending.