Okabe is a lanky young man, with a square jaw and bony cheeks. His short black hair is swept back. He has a small amount of stubble on his chin and cheeks. His eyes are brown. Okabe often wears a long white lab coat, over a plain white T-shirt (light gray in the anime), and khaki-colored slacks. The breast pocket of his lab coat has a red pen sticking out, and around his slacks he wears a black military-style canvas belt, with a gold-colored buckle. He has dark socks and wears green slippers when inside the lab. Rintaro Okabe is initially portrayed to have a severe case of Chuunibyou with eccentric and sometimes Tsundere tendencies. As a self-proclaimed insane mad scientist, he often makes grand and long-winded declarations instead of getting to the point. He usually gives off the impression of being delusional and paranoid and would talk to himself on the phone especially when he cannot get his way and engages in fits of maniacal laughter. Okabe is socially inept and has poor social skills that Kurisu considers the childlike Mayuri to be normal by comparison. Although very intelligent, Okabe is also shown to be quite naive; when Kurisu sent him a D-Mail saying that he was an airhead, he bought her claim that it was a compliment, only realizing later that it essentially meant his head was full of air. He does not care about anyone he considers as an outsider and blatantly ignores the messages, opinions and feelings of others which he considers irrelevant to the experiment. Nevertheless, he is not hesitant to lend a helping hand to people whom he had never met, as shown in his first encounter with Luka. He lacks management skills and has no sense of priority often rushing headlong into things and cutting off others when conversations do not go his way. This is very evident in his first time leap where instead of telling everyone clearly about what happened and what would happen and coming up with a good plan of action, he kept everyone else in the dark by brushing off their questions of concern and started running around the city to look for Mayuri. For someone prone to using others to achieve his goals, up until that point he has always kept others away and never confide in them when it matters the most. Okabe is very forceful when it comes to proving a point as seen when he assaulted Luka in order to prove that Luka was a boy dressed up as a girl, and rather then be remorseful for this, he considers his punishment as "torture". He also once reduced Kurisu to tears by yelling at her for calling him 'Okabe' instead of 'Hououin Kyouma' but was baffled at her reaction.