Junko, initially known as the Ultimate Fashonista (or Gyaru in the original Japanese version), is the main antagonist of the entire Danganronpa series.
She's seemingly one of fifteen participants of the Killing School Life in Danganronpa: Trigger Happy Havoc. However, the last chapter reveals that the Junko participants knew was actually her twin sister, Mukuro Ikusaba, in her disguise. The actual Junko Enoshima reveals herself once the secret of her identity and role as the mastermind behind the killing game are revealed. It's also revelead that both her and her sister were also known as Ultimate Despairs, as a result of their yearning for the feeling of despair and causing multiple terroristic acts to achieve so. Junko reveals she had also caused the apocalypse known as The Tragedy, along with her followers.
Danganronpa/Zero focuses on an amnesiac Ryoko Otonashi learning about the evil deeds of Junko and Mukuro. It's later revealed that Ryoko was just an amnesiac alter ego of Junko created by her love interest, Yasuke Matsuda; and the Junko that she encountered was Mukuro in her disguise. The novel also reveals another hidden talent of Junko: Ultimate Analytical Prowess.
As a result of Junko analyzing Chihiro Fujisaki's code for Alter Ego back when she was alive, she was able to program an AI version of herself called Alter Ego Junko. Said AI is revealed to have been a co-mastermind of the Killing School Trip in Danganronpa 2: Goodbye Despair, alongside Izuru Kamukura, Hajime Hinata's omnipotent alter ego. Izuru had gathered the Remntants of Despair from Class 77-B and, along with them, seemingly gave himself up for a rehabilitation program by Makoto Naegi. There, he had uploaded Junko's AI to the Neo World Program, where she took over and hosted the killing game. In the last chapter, she also reveals more about The Tragedy, including the specific deeds done by her followers, Remnants of Despair.
Although Junko doesn't physically appear in Danganronpa Another Episode: Ultra Despair Girls, as the game takes place after Danganronpa 1 but before Danganronpa 2; her AI version still appears, although with Kurokuma and Shirokuma being hosts for it instead. Both kumas end up secretly pulling the strings to fuel the conflict between the Warriors of Hope and the adults of Towa City who had no children of their own. While she's not the main antagonist of this installement (as it's Monaca instead), she, as Shirokuma controlling Big Bang Monokuma, ends up being the actual final boss in the game.
Since the real Junko is already dead and her AI version has already been defeated, she's only mentioned and appears throughout flashbacks in Future Arc of Danganronpa 3: The End of Hope's Peak Academy. However, Despair Arc shows how The Tragedy came to be, with Junko taking the central focus as of episode 5. Aside from showing how Junko brainwashed Class 77-B (aside from Chiaki Nanami and Ryota Mitarai) to become her followers, the anime also further elaborates on the connections between her three titles. Through her speeches to Izuru meant to break his spirit, it's revealed that her analytical talent is her main one, which causes her to predict fashion trends, hence her more friendly cover title of Ultimate Fashonista; but with the ability to analyze and predict everything causing her boredom, thus making her yearn for chaos and despair, hence her title as the Ultimate Despair.
Although she doesn't physically appear in Danganronpa V3: Killing Harmony, she still appears through fabricated Flashback Lights, as well as due to being Tsumugi Shirogane's main cosplay choice and the inspiration to her and her killing game. With Tsumugi using the title of "Junko Enoshima the 53rd," as well as through some of her meta jokes, it's revealed that Junko had been the mastermind of every single prior installement in the franchise in some way. Junko also appears herself in the non-canonical bonus mode, Ultimate Talent Development Plan, which shows an alternate universe where she attends Hope's Peak Academy, but doesn't cause The Tragedy.
- Enogami — the ship between Junko and Byakuya Togami
- Junkomaeda — the ship between Junko and Nagito Komaeda
- Junkozuru — the ship between Junko and Izuru Kamukura
- MatsuShima — the ship between Junko and Yasuke Matsuda
- MonoJunko — the ship between Junko and Monokuma
- Naejunko — the ship between Junko and Makoto Naegi
- Celesjunko — the ship between Junko and Celestia Ludenberg
- Junkan — the ship between Junko and Mikan Tsumiki
- Shiroshima - the ship between Junko and Tsumugi Shirogane
- Junko x Despair — the ship between Junko and despair
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- In the Japanese version, her voice actress, Megumi Toyoguchi, also voices her twin sister, Mukuro Ikusaba; Kurokuma, and Shirokuma (the latter two are physical avatars for Alter Ego Junko). A similar role split is also present in the English version:
- Jamie Marchi voices both Junko and Mukuro in both anime installements of Danganronpa franchise.
- Meanwhile, in the game installements, Amanda Céline Miller and Erin Fitzgerald both voice Junko, with each voice actress voicing different parts of Junko's personality - Fitzgerald voices "Teacher Junko", "Monokuma Junko" and "Model Junko". Miller and Fitzgerald also voice Shirokuma (Miller) and Kurokuma (Fitzgerald) respectively.
- Miller and Fitzgerald also share the voice of Toko Fukawa (with Miller voicing Toko and Fitzgerald voicing Genocide Jack), and Seiko Kimura (Miller voices her as a child and Fitzgerald voices her as a Hope's Peak student and Future Foundation member.)