Full Name: Sofia Mantega (Barrett)On a trip to New York to see Derek, Sofia and her friends were attacked by the Reavers, who kidnapped her father. The students managed to defeat them, and Derek quit his job, rather than let Barrett mistreat his daughter. Sofia met with Derek again on Parent’s Day, but when her father also arrived, she told them off, thinking she was being used so Derek could get his job back. After helping Josh Foley and Wolfsbane rescue Noriko Ashida from Salem Center, she regretted her actions, but found Derek waiting for her in her room.
Soon after being assigned to the New Mutants squad under Dani Moonstar, Sofia was named the leader, although some in the group felt that Prodigy III was better suited for the role, given his ability to absorb knowledge. In fact, after Sofia's emotional outbursts cost the squad a few rounds of competition, she willingly offered to share the leader's position with David, which worked much better. While the New Mutants appeared to loathe their rivals the Hellions (Emma's squad), in fact Sofia became very attracted to (Julian Keller) Hellion, her opposite number. They even went to the spring dance together.
Following M-Day, however, Sofia was de-powered, and while Julian wanted to keep seeing her, she was turned off by his attitude towards the other ex-mutants, and his support of Emma's decision to send them home. Sofia apparently was picked up from the school, and was not on the bus that was bombed by Stryker.
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