1. Rin's death had a profound impact on Kakashi. Despite not being Kakashi's fault, he felt immense guilt for not being able to protect her.

2. Obito, Kakashi's comrade, played a crucial role in guiding Kakashi back to the right path. Kakashi owed him a debt but failed to fulfill his promise.

3. Sakura, a member of Kakashi's team, received less attention and training compared to Naruto and Sasuke. Kakashi didn't teach her any jutsu and focused more on the other two.

4. Hanare, who appeared in the Kakashi's Love Song episode, shared a moment with Kakashi. However, they didn't end up together, potentially due to Hanare's spy identity.

5. While not Kakashi's student, Kakashi had a moral obligation to guide Yoro. However, he rejected Yoro's request for guidance, leaving Yoro feeling frustrated. If Kakashi had provided guidance, Yoro may have developed new ninjutsu.