Josh Carter, a 35-year-old math professor and former gang leader, chose to become a math professor to share his love and knowledge of mathematics. He's stern, intimidating, and possesses a sharp tongue. Despite his grumpy exterior, he's driven by the desire to share his mathematical knowledge. When he recognizes a student's potential, he becomes invested in their success and pushes them to improve further. He values hard work and dedication over natural talent. He's a man of few words.