Although the students of Class 3-E are always trying to kill their invincible alien teacher, the nature of their relationship is genuine and tender. It is also one of the most unique teacher-student bonds in anime.
Saitama and Genos don't share the typical power dynamic of a mentor and student. Over time, they become friends. Saitama doesn't take his duties to heart, and Genos learns by observing his master.
Fujiwara no Sai's endless passion and teaching skills transform Hikaru, an apathetic boy, into an enthusiastic player.
Izumi might look like a regular homemaker. But she's a fearsome alchemist and a strict teacher who trains the Elric brothers to become the nation's greatest fighters.
Reigen and Mob have one of the most unconventional teacher-student relationships in anime. Reigen teaches Mob about maturity, dealing with adversity, and acceptance.
Rayleigh was one of the few people who could mentor Straw Hat Pirates' headstrong captain, Monkey D Luffy. They shared a great bond, and Luffy respected and admired Rayleigh for his skills.
Mayank Markande
All Might did not perform his duties as a conventional teacher. But he inspired his student and successor, Midoriya Izuku, to protect the weak and never lose sight of one's values.
Kakashi Hatake is one of anime's most iconic mentors. Every member of Team 7 thanks him for their progress and gradual transformation into competent adults.