List of Main Characters
- Rintarō Okabe - (CV: Mamoru Miyano) a self-proclaimed mad scientist who usually refers to himself as "Kyouma Hououin".
- Kurisu Makise - (CV: Asami Imai) Kurisu is an extremely talented neuroscience researcher, having had her research published in the "Sciency" academic journal at the young age of 18.
- Mayuri Shiina - (CV: Kana Hanazawa) is a long time childhood friend of Rintarō and is a bit of an airhead. Mayuri enjoys creating cosplay costumes and has a part-time job at a maid cafe.
- Itaru Hashida - (CV: Tomokazu Seki) an experienced hacker in both software and hardware technologies. He is also well-versed in things pertaining to otaku culture.
- Suzuha Amane - (CV: Yukari Tamura) works part-time for the landlord of Rintarō's flat and is on a search for her father in Akihabara. She enjoys riding her bicycle and has a strong dislike for Kurisu.
- Ruka Urushibara - (CV: Yuu Kobayashi) is a bishōnen who looks strikingly like a girl and even wears the garment of a miko despite being a boy. He is a close friend of Mayuri and is often asked by her to try on her cosplay costumes.
- Faris NyanNyan - (CV: Haruko Momoi) works at the maid cafe "Mayqueen Nyannyan", the same maid cafe that Mayuri works at, and is the most popular waitress there.
- Moeka Kiryū - (CV: Saori Gotou) is a tall girl that Rintarō bumps into in Akihabara and is on a search for the IBN 5100 personal computer. Moeka is extremely protective of her mobile phone and becomes agitated if someone tries to take it from her hands. She is very shy and prefers to talk to someone by sending them a text message instead of speaking.
Side Characters
- Yūgo Tennōji - (CV: Masaki Terasoma)
- Nae Tennōji - (CV: Ayano Yamamoto)
- Dr. Nakabachi - (CV: Mitsuru Ogata)
- John Titor - (CV: Hiroshi Tsuchida)
- Eisuke Urushibara - (CV: Mitsuaki Hoshino) is the head priest of Yanabayashi Shrine and Ruka's father. Kurisu praised his good nature,
- Yukitaka Akiha - (CV: Taira Kikumoto) is a large landowner of Akihabara. He once possessed IBN5100 but sold it for an important reason.
Minor Characters
- 4°C (reads 'Shido') - ( CV: Minoru Shiraishi). Shido is the leader of Viral Attackers, a group of delinquents that play the popular board game "Rai-Net Acces Battlers". His idiocy almost rivals Okabe's.
- Woman of Sambo - (CV: Yuuko Ushida) a shopwoman of gyudon restaurant. She is known for often warning the lab members of the strict "No Cellphone" rule.
- FES - (CV: Yui Sakakibara) is the lead vocalist of indie band Phantasm, from 5pb/nitroplus game Chaos;HEAd. She sings the false ending theme of Steins;Gate.
- Lightning Fast Knight-Hart, is the handle name of online-MMORPG player Takumi Nishijō, who is somewhat infamous on internet communities such as @channel. He is the protagonist of the game Chaos;HEAd.
- Fubuki and Kirari. Mayuri's cosplay friends. Fubuki requested Mayuri to fix her costume which Mayuri had made for her.
- Mother and boy (CV: Toa Yukinari, Mai Hirano): On Manseibashi bridge at 13-Aug-2010 17:20, the two talked about white Shinkansen bullet train.
Anime within Anime Characters
- from "Rai-net Takeru"
- Takeru - main hero
- Kirari - heroine
- Upa- Takeru's digital pet and legendary program.
- from "Blood Tune the Animation" (also from Chaos;HEAd) [fictional Official Site]
- Seira Orgel - main heroine
- Sedona - rival bounty hunter
- from "The Familiar of Ten "
- Louice - main heroine. Quote: "Are you stupid? Do you want to die?"
- Gero Frog (Gerokaerun)
- Popular mascot series from Chaos;Head.
