A former Borg drone, once Three of Nine, who shared a mental link with two others from Seven of Nine's old unimatrix and wanted the truth about their crash.
Marika Willkarah is one of three former drones who board Voyager at the Markonian Outpost in Survival Instinct. As Three of Nine, she served in the same unimatrix as Seven of Nine, and a flawed removal of their implants left her joined to her two companions in a shared consciousness.
The trio want Seven to recover the memory of the crash of their scout ship years earlier, when the four briefly regained their individuality before Seven forced them back into the Collective. Seven ultimately has the link severed, giving Marika a month to live as an individual. She chooses to spend it aboard Voyager.