An individual may instigate a fight to prove themselves, whether to show that they can hold their own or prove that they're superior in strength and wit. Whatever the case may be, it's not too uncommon to witness this kind of fight, especially in anime.
The case of a fight is practically endless in the realm of anime. It could be anything from two delinquents in a romance anime fighting to an action packed sequence of a hero versus villain battle. One of the most interesting is a fight that occurs between master and pupil, no matter if the reason is for a friendly spar or a pupil wanting to settle a score.
10 Meliodas Has To Fight His Greatest Admirer (The Seven Deadly Sins)
In the past, Meliodas trained Gilthunder in swordsmanship and admired him greatly. Unfortunately, after the accusation that Meliodas and the other Sins killing Gilthunder's father, the relationship between them changed. Seeking out revenge, Gilthunder instigates a fight with Meliodas in the Forest of White Dreams, and though the battle ends quickly, this isn't the last Meliodas has to fight Gilthunder, the Holy Knight.
At the Kingdom of Liones, Meliodas and Gilthunder fight again to settle the score. After a sequence of events mid-battle, it's revealed that Gilthunder was fighting as a loyal puppet and couldn't resist as the life of his loved one was in danger. So, there was never really any bad blood for these two in The Seven Deadly Sins.
9 Pain Fights Jiraiya In A Fateful Battle (Naruto Shippuden)
Pain was one of the orphans who Jiraiya decided to care for and train in ninjutsu in Naruto: Shippuden. Due to his background, Pain dreamed of a world without suffering. He continued to have this dream as he grew up, but the means of how he wanted to make his dream come true were twisted.
After hearing news of his former pupils' deeds during the years he was gone, Jiraiya went to confront them. A series of events followed throughout the confrontation, and things did not end well for the master and former pupil.
8 Levi And Kenny Fought As Nephew Vs. Uncle (Attack On Titan)
In the series Attack on Titan, both Levi and Kenny lived in the Underground, and Kenny took Levi in after the unfortunate passing of his sister, Levi's mother. Even though Kenny didn't consider himself a father figure, he raised Levi and taught him how to survive, from teaching Levi how to fight to how to get along with people. When Kenny understood that Levi would be fine on his own, he left Levi to his own.
After many long years, the two meet again in Stohess District during an operation between Levi and his squad that Kenny interrupts. The two are now on opposing sides, as Levi is with the Survey Corps and Kenny with the Anti-Personnel Control Squad - soldiers specifically recruited to combat the Survey Corps.
7 Soi Fon Worshiped Her Master Until She Disappeared (Bleach)
As a child, Soi Fon was told she will live only to serve Yoruichi. Consequently, Yoruichi saw potential in Soi Fon, so Soi Fon became her protégé and a member of the Personal Guard Squad. She adored Yoruichi and their relationship to the extent of worship until Yoruichi disappeared without a word. Since then, Soi Fon hated Yoruichi for betraying her.
In Bleach's progression, the two meet again when Yoruichi returns to Soul Society. The two immediately start fighting as Soi Fon is set on showing Yoruichi how much stronger she is now - more than her former master. However, Yoruichi stops Soi Fon's final blow effortlessly, proving that she is still superior between them.
6 The Reaper Followed In His Master's Exact Footsteps (Assassination Classroom)
After deeming the assassination of his father "a beautiful skill," a young boy wanted to become an assassin under the guidance of the Reaper - the one responsible. Now an apprentice, the boy only wanted praise from his master. Instead, he learned he'd only be regarded as a tool. So, he abandoned his master during a mission and decided he'd carry out assassinations in the exact fashion as his former teacher under the same name as the Reaper from then on.
The reunion begins during Koro-sensei's "birthday" celebration, with the apprentice as the current Reaper and the original being Koro-sensei. Even more so, like his master, he also has been augmented with Antimatter Tentacles. Now, Koro-sensei fights for his life and his students' lives against his former disciple towards the end of Assassination Classroom.
5 Jin Was A Star Pupil Who Fought His Master In Self Defense (Samurai Champloo)
Samurai master Enshiro Mariya and his star pupil Jin had a very close relationship in Samurai Champloo. Due to Kariya Kagetoki's request, Enshiro asked Jin how'd he feel if the school became a school for assassins. Jin was displeased by the idea, not wanting the school to be corrupt in the future. After Enshiro reported this to Kariya, Enshiro was ordered to kill his favorite student while he was asleep.
Jin instinctively woke from his sleep, and a quick but intense fight ensued. Jin was shocked when he realized the person he fought was his master and that he therefore killed his master by mistake.
4 The Truest Gundam Fight Between Master And Student (Mobile Fighter G Gundam)
In Mobile Fighter G Gundam, Master Asia adopted an eight-year-old boy named Domon Kasshu who had run away from home. Master Asia sheltered Domon and trained him, and Domon eventually earned his master's title of the "King of Hearts."
Unfortunately, the last moment between these two was an intense and sorrowful battle. The final Gundam Fight is a master and student fight to prove each other's points for the sake of humanity. Domon makes the final blow, proving he has surpassed his master, and Master Asia acknowledges this fact. Despite the fight, the two recite their invocation as they have before for the last time.
3 A Fight Of Parental Tough Love Between Arima And Haise (Tokyo Ghoul: Re)
Arima was like a father to Haise in the series Tokyo Ghoul. He often sparred with Haise as a means of training, giving him advice and checking on Haise regularly. Haise himself even considered Arima as a father figure since he was the person that saved him and helped him create a new life.
In a final battle between the duo, Arima provokes Haise to fight him seriously in an attempt to put a specific plan in motion. When the battle finally ends, Arima reveals certain secrets to Haise before his final moment.
2 All Might Fought Bakugo And Midoriya As Part Of An Exam (My Hero Academia)
During the First Term Final Exam, the Class 1-A students have to work together in teams of two in a mock battle against their teachers in My Hero Academia. Midoriya and Bakugo have to work together in a battle against their teacher and number one hero, All Might.
The battle already starts on the wrong foot since Bakugo refuses to cooperate with Midoriya, specially since the two have opposing ideas on how they should combat their teacher. Despite one compromise between the two, All Might is still a challenge. After taking plenty of hits, the two still manage to pass the test.
1 Bang Fought His Rogue Former Disciple Garou (One Punch Man)
In One-Punch Man, Bang is the former master of Garou, having taught the disciple everything he knows about fighting. But Garou went on a rampage and attacked the other students, so Bang kicked him out of the dojo.
Garou then started hero hunting, and Bang and his brother, Bomb, set out to stop him, with Bang eventually fighting his former disciple almost to death. The two fight, with both Bang and Garou noting new and strange happenings among each other. Then on the verge of losing and close to death, Garou escapes, leaving Bang disappointed that his former #1 disciple has become a true monster.