Okabe Rintarou

The protagonist. First year student attending Tokyo Denki University. Calls himself a Crazy Mad Scientist, he acts like a villain but is rather immature. After enrolling in university, he went to Akihabara to open up a laboratory called the "Future Gadget Research Establishment", where he invents gadgets that are rather useless. He also talks to himself on the cellphone, his words not making much sense. Supposedly, he has very few friends that can understand what he's talking about.

• Often calls himself "hououin kyouma" (鳳凰院凶真).
• Mayuri and Daru just call him "Okarin" (オカリン), abbreviated after his name.
• The phrase he uses to end conversations, particularly with himself, is "Eru Psi Congruu"
  (エル・プサイ・コングルゥ).

Hashida Itaru

First year student in Tokyo Denki University. Pro-active otaku, who's got a thing for both 2-D and 3-D girls. Talks quite a lot, and uses @ch [1] terminology. Plenty of statements he makes could be taken as sexual harrassment. He and Rintarou have known each other since high school. Usually turns down Rintarou's ridiculous requests as "annoying", but in truth gets them done in proper order. However, he trusts Rintarou as a friend. Has great confidence in his programming and hacking abilities (he doesn't mind being called a Super Hacker, but doesn't like it when people call him Super Haker [2]). He's always in front of the computer.

[1] @ch is a spinoff of 2ch.
[2] In Japanese, you should say "hakkaa" (ハッカー) but people keep calling him "hakaa" (ハカー).

• Has the nickname "Daru" (ダル), abbreviated after his name.

Makise Kurisu

A research member in Victor Qondria University's Brain Research Program (age group matches that of third-year high school, but skipped a grade through America's educational system). 18 years old, skipped a grade and is in university. Also famous in America for writing thesis papers, part of which is covered in the news. Tsundere. Thanks to skipping a grade in America as a girl, she was envied by people around her, and ended up building a strong personality. Doesn't want to show weakness to others, so she always has a stern expression. However, she is very curious, and when she builds interest she pokes into things. Occassionally has views that differ from regular opinion, like, "The experiment data is more important than the subject's privacy." Rintarou often tells her, "Hey, you've got a pretty good sense of being a Mad Scientist", but she's not one to agree to such things personally.

• Rintarou has given her plenty of nicknames, in particular "Christina" (クリスティーナ) and "Assistant" (助手).

Shiina Mayuri

Second year in Kasensou Private Prepatory Academy. Childhood friend of Rintarou's, and slow by nature. Speaks in a very wavy manner, and seems to always be smiling and having fun. She's quite the optimist. She has trouble understanding complicated theories, but doesn't mind as long as it's enjoyable. Doesn't like people arguing, and is depressed when things are unpleasant. Though she'd like to ease the situation in such cases, she's not really good at reading between the lines. She often went with her grandmother to see the stars on her grandmother's back. Because of that, she has a habit of reaching her arm out to the sky at times, which has led Rintarou to naming it the "Stardust Shakehand". She abruptly does this (even if she's talking with someone), which surprises everyone around her.

Amane Suzuha

A daughter that really likes riding bicycles, and is quite energetic, though a little crude. If you stick around her, she's surprisingly cautious. Very helpful. A little too familiar with things, but doesn't dig too deep. Not quite comfortable with having other people help her. For that reason, she spends as little time as possible. Her personality drastically changes when it comes to her own interests. Proactive. Has a habit of using strange and difficult vocabulary at times, but somehow you can tell she's purposely doing so. Ended up hanging out with the Future Gadget Laboratory since she started working at the CRT TV Workshop.

Urushibara Ruka

Second year in Kasensou Private Prepatory Academy. Mayuri's classmate. Has the personality of a polite, well-groomed and justified kind of beautiful girl (though a guy). Uses honorifics specifically with Rintarou. Doesn't push his opinions much upon others, but when he does he's quite bashful and blushes quite a bit. Because he's quite serious by nature, he simply believes what others say. Thanks to that, he thinks all the ridiculous stuff Rintarou talks about is that of reality. Rintarou makes him out to be his student on his own, and is currently in the middle of brainwashing him. A very shy person, he often turns down Mayuri's requests to cosplay.

Feiris NyanNyan

Second year in Kanaria Private Academy. Feiris is someone who works part-time at a maid cafe called "MayQueen+Nyan²". Mayuri works with her. She's quite child-like. Acts like a childish devil towards men. Also adds embarrassing "meows" [1] to her speech. Has an ability to see into people's hearts just by looking into their eyes (which she calls the "Cheshire Break"). Respects her father a lot, as well as having a father complex.

[1] In Japanese, this is often said as "nyan" (ニャン)

Kiryuu Moeka

Works at the Arc Rewrite Editorial Production. Extremely addicted to cellphones, even to the point of mailing people that are right in front of her. Seems she's looking for an old-school computer called the IBN 5100.

Tennouji Yuugo

Owner of the CRT TV Workshop set up in the first floor of the Oohiyama building. Also the landlord. Widower. Has an only daughter by the name of Nae, though he's the only one who loves CRTs. Hates LCDs with a passion, and perhaps anarchic. Though he's not quite enthusiastic in the CRT TV Workshop, for some reason he doesn't seem like he'd go bankrupt anytime soon.

• Nicknamed "Mr. Brown" by Rintarou, due to the loan word "Brown" used in the Japanese term for CRTs (ブラウン管).

Tennouji Nae

Tennouji Yuugo's only daughter, in grade school. Really loves her father, and often shows up at the CRT TV Workshop on the way home from school. She's a bit docile. Thinks of Mayuri as her "older sister", but is often frightened by Itaru and Rintarou.

Dr. Nakabachi

Scientist interested in time travel research. Spoke at the Akihabara Radio Hall.