Red Adder was a male human who was a part of the Nexu Claws criminal organization, which operated on the planet of Burnin Konn. The gang once came across the smuggler named Riley and their sibling, and following a speeder-related event, they put a bounty on both of them. During the time of the Iron Blockade, Riley's sibling, assisted by the Ivax Syndicate, tracked down the gang and killed numerous members of the Nexu Claws. After the massacre, the sibling confronted Red Adder. Although he initially intended to eliminate Riley and their sibling, he consented to withdraw the bounty and leave them in peace after Riley's sibling threatened him with the Syndicate's support.
The character of Red Adder initially showed up in Star Wars: Uprising, a video game that launched on mobile devices in 2015.