Risa

It would be even better if in addition the borg only offered assimilation to individuals by choice, defending their right to join with overwhelming force and leaving everyone else alone. There would be a whole moral to-do about prisoners choosing the collective and the borg showing up to get them and then the Starfleet people who are lonely decide to go and then someone thinks they need to save one of those people so they go in with a plan to destroy the collective from within but realize that everyone is there by choice and they have the option to leave but don't.