Though not a samurai, he appears to maintain a certain degree of bushido, and is frequently mistaken for one. Unlike Luffy and most of the other Straw Hat pirates, Zoro has been known to kill his opponents if he has to, though never in cold blood. Zoro has a stern, serious and distanced personality, but, unlike Robin, he often reacts in a goofy and exaggerated comic style due to his gruff, impatient attitude. On the ship, he normally either trains with weights or sleeps. The only work he is seen doing regularly is hoisting the anchor using his great strength. He also likes sake, almost to the degree that Luffy likes meat, but like Nami, he never gets drunk due to his inhumanly-high endurance and tolerance for alcohol. Another notable trait is his lack of orientation, as Zoro often gets lost, even in small, familiar spaces or when being led by someone. Despite this, he is often the first to sense an enemy or danger, and the first to react. He is often displayed being well aware of dangerous situations and people around him. Zoro often also reminds others of the harsh facts, which often shocks some of the other crew members, although they usually decide he is right. Zoro has also stated that he is an atheist, and has never believed in anything except himself. He often comes across as arrogant and overconfident, but only because he knows he's a strong man with great fighting ability. Even so, Zoro knows that he still has a lot of untapped potential, and is constantly seen training and trying to improve his fighting skills. He also adheres to a strict sword master's code of honor, and never falsely brags or lies about his abilities, sometimes outright admitting a weakness, even to an enemy. He also never tries to escape from a fight or use trickery to win, believing that doing so is cowardly and scorning anyone who uses such tactics. Zoro is very vigorous, strong-willed, and determined.

Rintaro Okabe (岡部 倫太郎 Okabe Rintarō?), often nicknamed Okarin (オカリン) or Hououin Kyouma (鳳凰院凶真), is a self-proclaimed mad scientist and the main protagonist of the Steins;Gate series. Okabe is a theatrical and eccentric individual. He is a self-proclaimed mad scientist, who likes to assume his "true name" "Kyouma Hououin" (鳳凰院凶真, Hououin Kyouma), and often uses this to introduce himself to others. Usually, people do not care and instead address him by his actual name or by 'Okarin' (his nickname), much to his chagrin. Okabe is also socially inept; his social skills were so poor that Kurisu considers the childlike Mayuri to be usual by comparison. However, he isn't hesitant to lend a helping hand to people whom he'd never met. Although very intelligent, Okabe is easily deceived by others. Okabe likes to pose as an agent working against a specific "Organization," which he suggests is always after him, as he believes this kind of image gives him an excellent and mysterious aura. However, this seems to disappear as the story progresses, with SERN likely replacing the "Organization's" villainous image. He usually gives off the impression of being delusional and paranoid, displaying eccentric mannerisms such as talking to himself on the phone and engaging in fits of maniacal laughter. (Source: Steins;Gate Wiki, Wikipedia)