Petra/History

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Petra grew up alongside her best friend, Val Thundershock.
Val was sent by Queen Barb upon Poppy's request to act as the ambassador for the Rock Tribe in TrollsTopia. Though Val returned and managed to convince many of her friends to relocate to TrollsTopia, Petra stayed behind. Val continued to write letters to Petra about her time in TrollsTopia. At one point, Petra also began to follow the band Bad Hair Day around. 
Over time, Petra became concerned for Val, as her writing style changed. So she visited the city to convince Val to return for her own sakes. Eventually, Val decides to stay in TrollsTopia, and Petra comes to respect that.