formation of his ninja squad, Team 7. The idea was scrapped; Yahagi told Kishimoto to focus the series' first two chapters on introducing Naruto instead and the focus on Sasuke and the rest of the supporting characters were shown in the next chapters for the first time. Once creating Sasuke's character, Kishimoto decided to use him as a protagonist rather than supporting character in order to start his development at the same time as Naruto. Kishimoto had read a variety of manga to obtain ideas for the creation of an effective rivalry between two characters, which he incorporated into Naruto and Sasuke's relationship. He was also inspired by his relationship with his twin brother, Seishi Kishimoto; since childhood, Masashi had worried about Seishi when he faced failure and had tried to help him. To contrast Sasuke with Naruto, Kishimoto made him less emotional and depicted him as a "cool genius"; he felt he had created an ideal rivalry in the pair, and when one character progressed he ensured the other did as well. Kishimoto wanted Naruto and Sasuke to seem like brothers and rivals, building on a mutual experience of childhood loneliness. Although Sasuke does not regard Naruto as a worthy opponent at first, he is surprised by Naruto's growth and becomes fiercely competitive. In the Part I finale, their rivalry leads to a fight and they grow further apart. Kishimoto said he did not want Sasuke to recognize Naruto as an equal until later in Part II. Although both characters had used ninja techniques throughout the series, Kishimoto wanted the two fighters to rely on hand-to-hand combat for the climax of their final battle. He decided to have Naruto forgive Sasuke because he had also forgiven Nagato, another former enemy. The final fight between Sasuke and Naruto was considered one of the biggest challenges ever faced by the staff from Pierrot as it took an entire month to adapt it from the manga. Director Hiroyuki Yamashita elected himself in charge of the battle which left most of the anime members relieved due to his experience. For the scenario, Pierrot received assistance from CyberConnect2, the video game development studio who had already adapted this battle through the fighting game Naruto Shippuden: Ultimate Ninja Storm 4. There was a need to make every movement in the fight look realistic, giving Sasuke a scary look as well as hair movement in order