what made branch so paranoid in the trolls movie?

Branch's tragic backstory reveals how he went from being a happy baby Troll in a popular singing group called BroZone with his four brothers, to becoming the paranoid, gloomy survivalist we know from the Trolls movies. After a disastrous concert led to the band's breakup and his family falling apart, Branch blamed himself and lost his love for singing. The final blow came when his grandmother sacrificed herself to save Branch from a Bergen, leaving him traumatized and turning grey. Despite the heartbreak, Branch never gave up hope that his brothers would return for him someday

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God i love that troll 💙