This is the true origin of Sasuke in Naruto

Masashi Kishimoto, creator of &;Naruto&;, revealed that Sasuke almost didn&;t exist in the anime. Initially, Kishimoto envisioned Naruto as a simple cook instead of a ninja with enemies and magical powers. The original idea was based on his one-shot &;Karakuri,&; which he was not enthusiastic enough about. However, by transforming the story into a plot about ninjas, the rivalry with Sasuke emerged.

The introduction of Sasuke was not initially planned. Kishimoto, after receiving feedback from his editor, Kosuke Yahagi, decided to add a rival for Naruto. Drawing inspiration from the manga &;Sasuke&; by Sanpei Shirato and the fictional ninja Sarutobi Sasuke, Kishimoto created the character of Sasuke Uchicha, copying the &;Karakuri&; outfit.

The original idea was to introduce Sasuke as a villain after the first two episodes, reserving that time exclusively for Naruto. However, Sasuke&;s fate changed, and Kishimoto opted to make him a protagonist instead of a secondary character. This decision allowed both characters to grow together.