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Why Osgood Won't Be the New Doctor Who Companion - History, Interrupted
Osgood is certainly a beloved character. However, her most endearing quality should also categorically exclude her from becoming a regular: she’s a Mary Sue. Granted, she hasn’t committed the cardinal sin of Mary Sues by impossibly, single-handedly saving the day despite being surrounded by a plethora of more qualified people, but she’s a Mary Sue nevertheless.