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Saitama (サイタマ)Race: Human
Height: 175 cm (5'9")
Weight: 70 kg (154 lbs)
Abilities: Immeasurable Strength, Immeasurable Speed and Reflexes, Infinite Stamina, Supernatural Senses, Invulnerability, Indomitable Will
Affiliation: Hero Association
Saitama is the most powerful hero alive. Having apparently trained himself to superhuman condition, Saitama faces an existential crisis as he is now too powerful to gain any thrill from his heroic deeds.
He is registered with the Heroes Association as a C-Class Superhero and is tasked to defend Z-City against Mysterious Beings.
Saitama is usually deliberately drawn in a simpler style than other characters, with a very rounded head and only a simple mouth and eyes. When drawn in a more 'action-oriented' style with more detail, Saitama is revealed to have sharp features, dangerous looking eyes, and chiseled musculature. His costume is a plain yellow jumpsuit with a short zipper at the collar and a belt. The costume is finished out by an ensemble of red boots and gloves, and a white cape.
For a superhero, Saitama is rather laid back. Because even the mightiest foes pose no challenge to him, he doesn't take his hero work very seriously. In spite of this, he is constantly searching for an opponent that can challenge him, since his superhero work is beginning to bore him because it's too easy. The combination of his attitude, unstoppable strength, and distinctively simple and 'unimpressive' appearance often cause his battles to become anticlimactic. Saitama will usually allow his opponents to rant about their motives and power up into their strongest forms before suddenly and nonchalantly obliterating them with one punch.
(Source: One Punch-Man Wiki)
OP characters are a common trope in anime, if not a loved one. An often repeated criticism of leads, particularly in shounen titles, is that they were too powerful. Distinguishing between the pros and cons of OP heroes is important to be able to understand if an OP lead can be a great character.