Main character of Steins;Gate, the self-proclaimed mad scientist.
During his time in elementary school, roughly around 1999, Okabe came down with a severe fever and collapsed from his illness. He muttered the words "Everything I saw began to flow together". After recovering from the illness Okabe received the power of the "Reading Steiner" which allows him to retain memories from previous diverging timelines.
Throughout his early childhood and beyond, Okabe was very close friends with Mayuri Shiina. Mayuri suffered a great loss when her grandmother died, reaching up into the sky as if attempting to join her. Terrified of losing his best friend he adopted his mad scientist persona, Kyouma Hououin, and told Mayuri she was his hostage and would have to stay with him, a reference to an old monster movie the two had watched together.
Okabe then founded the Future Gadget Laboratory, where he and Mayuri would meet everyday. Eventually Hashida Itaru, Okabe's friend from high school, joined the lab.
Okabe is currently a first year at Tokyo Denki University. His favourite drink is Dr Pepper, stating it is a drink for "intellectuals", like himself.
Okabe first meets Kurisu when he is attending a seminar on time travel theory, although she seems to recall talking to him previously he has no recollection of these events. Later on he witnesses her dead body on the floor, stabbed by an unknown assailant. Afterwards, he sends a text to his friend Hashida Itaru 'Daru', which unknowingly causes the first time divergence, altering the past and preventing Kurisu's death. Kurisu eventually joins the future gadget lab after realizing that the Phone Microwave in fact works as a primitive time machine.
The two get off to a rocky start, Kurisu frequently referring to Okabe as a pervert and an idiot, in addition to her annoyance of various given nicknames such as "Assistant" and "Christina".
Despite being two years her senior, Okabe and Mayuri have been close friends ever since early childhood. The two share an immensely close bond,as demonstrated by events that ocurred as they were growing up.
When Okabe was struck with fever and collapsed, Mayuri wished upon a shooting star three times for him not to die, the next day he had fully recovered. Mayuri now claims that his life was saved because of her intervention.
In addition, the entire future gadget lab, and the mad scientist persona were constructed in order for Okabe to help cure Mayuri's sadness and prevent her from chasing after her deceased grandmother.
Mayuri playfully refers to Okabe as Okarin.
Daru and Okabe met in high school, roughly two years before the beginning of the series. Daru was the third member of the Future Gadget Laboratory, and Okabe greatly admires his engineering and computing skills often referring to him as the "Super Hacka". SPOILER WARNING: Click here to reveal hidden content.
Okabe originally meets Suzuha while she is working as a part-timer at Mr Braun's shop in the same building as the Future Gadget Lab. The two bond after Okabe directs Suzuha to a fireworks show, something she had always wanted to see, but was never able to. SPOILER WARNING: Click here to reveal hidden content.