The Best Sensei of Anime World

       Master Roshi ( Dragon Ball)

•  Muten Roshi , known as Master Roshi in English language versions of the Dragon Ball  series,also known as the Kame Sennin , translated into Turtle Hermit or Immortal in English due to the heavy turtle shells that he and his students would wear on their backs for weight training, Master Roshi is an ancient and wise martial arts master, as well as the innovator of the kamehameha technique. His students include Grandpa Gohan, The Ox-King, Son Goku, Krillin, Yamcha, and others. Master Roshi is depicted as a mighty warrior who constantly defies expectations in spite of his advanced age. He is considered a stock character, as he is both the elderly martial arts master . Roshi is known for his lewd actions throughout the series and is constantly ogling at young women on television exercise shows in his spare time or looking at pornographic magazines.  On the other hand, Master Roshi would be depicted as a very wise and compassionate person during the more serious moments in the series, who loves life and its simple pleasures, but is willing to make the ultimate sacrifice for his friends and students if necessary against various opponents who could not be dispatched by conventional means. 

 Kakashi Hatake(Naruto)

• Kakashi Hatake   is the teacher of Team 7, consisting of the series' primary characters, Naruto Uzumaki, Sasuke Uchiha, and Sakura Haruno. He is initially portrayed as a detached and apathetic figure, but as the series progresses, his loyalty to his friends and students becomes increasingly apparent. Kakashi's past has been extensively explored in the series, resulting in a gaiden being devoted to his past experiences. Kakashi Hatake is introduced as the Jônin (elite ninja) leader and in charge of Team 7, a new ninja team including Naruto Uzumaki, Sasuke Uchiha and Sakura Haruno. He first appears as a carefree character as he tends to lose track of time, and is frequently late to his appointments as a result. However, when testing his students, Kakashi reveals himself as a strong opponent to the point he fights while reading erotic novels. Kakashi is revealed to be very famous in the Naruto world, earning him the moniker "Kakashi of the Sharingan"  for possessing the Sharingan, gaining it from a member of the Uchiha clan he was friends with. It grants him the ability to mimic the movements and jutsu of others. Although most of Kakashi's abilities were acquired with his Sharingan, he also invented the Chidori and its Lightning Blade variation, a collection of lightning chakra in one's hand that uses the Sharingan's visual ability to lock onto a target.When first forming Team 7, Kakashi does not turn them into his students until instilling in them the concept of teamwork even if they have to break the rules he gave them.Kakashi also reluctantly participates in various kinds of challenges by his childhood friend Might Guy who considers Kakashi his rival.
  

Kisuke Urahara (Bleach)

• Kisuke Urahara  is the owner of the Urahara Shop, whose habit of wearing traditional Japanese wooden sandals and a bucket hat earned him the nickname "Mr. Hat-and-Clogs" . Kisuke is usually quite laid-back and has a jovial if not comical attitude, tendencies that tend to drive away customers. Despite his odd work ethic and personality, Kisuke is a keen intellectual with an inventive streak and an uncanny ability to discern an opponent's weaknesses and attack patterns with ease. Kisuke also leaves his store unattended for long periods of time, like when he trained Ichigo Kurosaki and his friends in the store's cave-like basement.
  Kisuke is eventually revealed to be actually the former Captain of Squad 12 after being promoted from his 3rd seat in Squad 2. A century ago, Kisuke caught Sōsuke Aizen in the act of converting Hiyori and their fellow Soul Reapers into Hollows. Though Kisuke managed to save them by turning them into Vizards, learning that Aizen was after the Hōgyoku he developed, Kisuke is forced to leave the Soul Society when framed for the crime and go into hiding in the World of the Living. Though he attempted to dispose of the Hōgyoku in the gigai he developed for Rukia, Aizen obtained the sphere. Later aiding the Soul Society in their battle against Aizen by creating a Fake Karakura Town, Kisuke engages Aizen in battle and is initially defeated. However, though defeated, Kisuke placed a special kidō seal on Aizen that activated after Hōgyoku rejected Aizen as its master.

Jiraiya(Naruto)

• Jiraiya    was a student of Hiruzen Sarutobi and one of the "Legendary Sannin"; along with Orochimaru and Lady Tsunade. Jiraiya appears as a perverted old man who occasionally returns to the village, reporting the activities of Orochimaru and Akatsuki. Referred to as the "Toad Sage" and "Pervy Sage", he mentored Minato Namikaze, the Fourth Hokage, and later became a godfather to Minato's son Naruto Uzumaki.Jiraiya grew up in the village of Konoha under the tutelage of the Hiruzen Sarutobi, the Third Hokage. As a child, bragging about his exploits, Jiraiya made many attempts to either woo women or spy on them while they bathe in the hot springs. While during a trip, he reverse summons himself to Mount Myōboku, where he learned Senjutsu from the Great Toad Sage who told him a prophecy he would someday have a student who would either save the world or destroy it. During his time he became known as the "Toad Sage" as the result of his training under the Great Toad Sage to obtain Senjutsu, enabling him to summon toads as allies during battle.For most of his adult life, though loyal to Konoha, Jiraiya periodically leaves his hometown to explore the world. He makes only sporadic appearances, returning to Konoha after long absences to report on information he has learned during his travels. Initially this information concerns Orochimaru's continued efforts to destroy Konoha, though eventually he also begins reporting on Akatsuki. While traveling, Jiraiya wrote his experiences in love, particularly those with Tsunade, in his Make Out series of novels which have become a best seller and earned him vast wealth. During some of his returns Jiraiya takes the time to train Naruto, teaching him his own signature abilities, and trying to teach him to control Kurama.
  

Koro-sensei(Assassination Classroom)

• Koro-sensei is the main protagonist and anti-hero of the series. He is the homeroom teacher of Class 3-E of Kunugigaoka Junior High School. He is initially thought to be the perpetrator of the explosion of the Moon, which has rendered it permanently in a crescent shape, this is later revealed to be false, as the true culprit was a mouse implanted with his cells that had been sent to the moon as part of an experiment. Despite not having the intention to get killed, he offered to governments all over the world a chance to kill him under the condition that he is allowed to be the homeroom teacher of Class 3-E until the end of the year, when he will destroy the Earth unless he is killed. He is dedicated to his task as a teacher and imparting his knowledge of assassination to the students, despite knowing full well that he himself is their target. However, one of his attributes is the fact that he is able to connect with each student individually- the reason why all of his students respect him despite knowing that he will destroy the planet in a year. He takes a form similar to an octopus with eight tentacles and his skin color changes depending on his mood. While he is initially believed to be an alien, he later reveals that he was once a legendary human assassin who was the first 'God of Death'. After being betrayed by his apprentice, he was captured and sent to a facility where a series of experiments were performed on him, transforming his body. Koro-sensei was born in the slums of an unknown third world country, where he soon learned he had a natural talent for killing and an inborn lack of empathy. He became an assassin, murdering anyone for the right price, even world leaders and the heads of entire militaries. However, after being captured and used as a guinea pig, he begins to learn compassion and empathy from a female intern whom he becomes close to. His decision to become a teacher involves his promise with the intern who thought that he was suitable to become one, later revealed to be Class 3-E's former teacher, Aguri Yukimura, who was selected to be his observer during the experiments performed on him. According to Koro-sensei, his lifespan will be over by the end of the school year in March, and if he is not killed by then, the whole planet will perish with him due to the explosive release of the anti-matter in his body that was generated by the experiments performed on him.