| This town belongs to all of us!!!
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— Chaco
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Chaco was a mischievous and ill-disciplined child belonging to the Winged Horde in Two River City. He was popular with his fellow children in the community and often played games with them. As a child he was watched over and picked on by Sid in equal measure.
He would participate in the SY 459 Spirit Festival, which would mark the first time he was able to complete the festival's trail of courage for children. He would encounter the spirit of his recently deceased uncle, Phobo, during this festival.
Known for his tricks and pick-pocketing tendencies towards both humans and kobolds, he often stole wallets and coin-purses from unsuspecting individuals in the city in a bid to both "toughen them up" and make a little money on the side. Despite his questionable actions, Chaco had a deep sense of pride for his hometown.
During the Dunan Unification War, Chaco's encounter with the young leader of the New Alliance Army led to a series of events that changed his perspective. Initially stealing the young man's wallet, Chaco repeatedly taunted him before eventually being ordered by his grandmother, Susu, to lead the young man to her.
Chaco's attitude towards the hero gradually shifted as he witnessed his efforts to thwart the Highland Army's plot exploiting racial tensions in Two River. Inspired to protect his hometown, Chaco played a crucial role in uniting all races of Two River, leading to the successful repelling of the Highland invasion.
Impressed with the camaraderie and mission of the New Alliance Army, Chaco decided to join their ranks, relocating to New Alliance Army Headquarters. He still held resentment and fear towards Sid, due to past mistreatment, such as being locked in a well for three days. So, when Chaco inadvertently introduced Sid to the New Alliance Army, leading to Sid's recruitment, he was quite dismayed.
Chaco proved to be valuable to the New Alliance Army, aiding in rescuing Teresa Wisemail's group from a trap in Muse City and offering support when needed. His speed and ability to fly and glide for short distances served him and the army well. Despite his new life with the army, Chaco remained connected to his friends in Two River, maintaining communication through letters.
After the conclusion of the war, Chaco returned to Two River, where he continued to engage in playful mischief with his friends.