To the world, Kayla Harrison embodies the fierce fighting technique and intimidating power on display Thursday when she dispatched the competition en route to America’s first Olympic gold in judo. But on the North Shore, she’s the affable friend and mentor who’s planning to become a firefighter. “She’s wise beyond her years, and an amazing fighter,” said Stephan O’Sullivan, a Marblehead woman who opened her home to Harrison last year. “But she’s also still a kid. She’s goofy.”
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