Juju Sereng is a human colonist and engineer who works at World 41’s HQ in Centralville and is friends with Don Davidson. Given his engineering background, Sereng is interested in the workings of the ansible that Mr. Lepennon and Mr. Or bring to World 41. After Davidson goes rogue and isolates himself and a handful of men on New Java, Juju is the one to communicate directly with Davidson over the radio. He expresses a disdain for the native Athsheans, which Davidson shares, but also suggests that Davidson is creating danger for the colonists by refusing to comply with the Athsheans’ neutrality terms. Juju does not agree with Davidson when Davidson suggests that he and his men can take on the Athsheans singlehandedly, suggesting that Juju is a reasonable man. Davidson’s decision ultimately leads to his own capture and imprisonment on Dump Island, and Juju likely remains in Centralville until the Shackleton returns to pick up the colonists.