Siral
Siral was a Borg drone who visited Unimatrix Zero during his regeneration cycles. He was well liked by Laura, another member of Unimatrix Zero, who told him upon his return that "I was hoping you'd come. It's great to see you." He responded "It's always good to be back." After Seven of Nine observed their interaction in 2377, she claimed to have remembered him, and was further informed by Axum that "you were friends." ()

Borg drones
Individuals