10 Most Satisfying Character-Arcs In Star Trek

Having been assimilated by the Borg at such a young age, Seven of Nine had a much harder path to reclaiming her individuality than ex-Borg who were only in The Collective for a short time, like Captain Picard.

When Voyager first separated her from The Collective, Seven was openly hostile and tried to summon the Borg to retrieve her and assimilate the whole crew. As she spent more time getting to know other Humans again, she became more comfortable. She was later able to further come to terms with her trauma when Voyager discovered The Raven: the ship she and her parents were taken from when she was a child.

Thanks to her unmatched intelligence and knowledge of Borg technology, Seven became a highly valued member of Voyager's crew. Her achievements included helping to build and manage the astrometrics lab, developing technology for the Delta Flyer, and literally curing death with Borg nanoprobes. When Voyager encountered Borg children, she helped them adjust to life outside of The Collective just as she had done. Still, despite these achievements, when Voyager returned home, Seven was denied formal entrance into Starfleet due to her Borg history.

After this period, Seven became a kind of vigilante for the Fenris Rangers. She had a lot of dark moments during this period, like when she was forced to kill Icheb after having his Borg implants forcibly removed. In Picard's first season, she briefly became the Borg Queen aboard the Artefact, and in season two she helped correct the timeline and save the future. She was able to prove herself to Starfleet eventually. 

She was finally commissioned into Starfleet as a Commander aboard the Titan-A, though she still faced discrimination due to her past as a drone. Still, she proved herself capable once again during the Changeling/Borg incident and ascended to the captaincy of her new ship, now renamed to be Starfleet's new flagship, the Enterprise-G.

Seven has come so far, but it's clear that her story is only just beginning, and we hope to see her and the crew of the Enterprise-G again soon.