|Fate||Murdered by Takumi Hijirihara|
|Manga||Danganronpa Gaiden: Killer Killer|
Eiichiro is a serial killer who has been murdering people since his debut as a mangaka. He was murdered after his crime was found by Takumi Hijirihara, the Killer Killer in chapter 3.
Eiichiro has an average build and messy medium length hair. He wears a dark colored skirt and glasses.
Eiichiro has a massive complex on being complimented, only being complimented for his drawings once when he was a child. He is also shown to be mentally unstable as he gets mad after being found as the culprit for the murders.
Prior to the Tragedy
Eiichiro wanted to become mangaka since he was in elementary school. A girl from his class praised his drawing and wonder if he wanted to become a mangaka in future. Eiichiro overjoyed because that's the first time that someone compliment him. Ironically, until he became a success mangaka in his 32, no one praised him ever again.
Danganronpa Gaiden: Killer Killer
Chapter 3 - Bessatsu Shounen Zetsubou Magazine
Eiichiro was a success mangaka that wrote a documentary serial manga series. The tragedy that he drew was none other than The Biggest, Most Awful, Most Tragic Event in Human History.
One day, Takumi, a member of SCI and also a fan of Eiichiro's work came out from a delivery box and without permission entered his apartment. Inside, Takumi revealed that Eiichiro's corpse depictions were too realistic. Takumi revealed inside that Eiichiro has been killing people and kept their corpse inside his "assistant" room that he used as inspiration to drew corpse depictions.
Eiichiro angered at Takumi who once again, a reader who won't praised his work. Before Eiichiro could killed him, Takumi performed a copycat murder. Eiichiro was impaled by his own giant pen by Takumi, copying the death of a victim of the Killing School Life, Mukuro Ikusaba.
- Eiichiro's victims were depicted as crucified corpses held up by ropes, similar to the state in which Chihiro Fujisaki's body was discovered. Another victim had a knife stabbed into her stomach, lying in the same position as Sayaka Maizono did in when she died in the Killing Game of Class 78th.
|Future Foundation's 6th Division||Juzo Sakakura • Ikue Dogami • Takumi Hijirihara • Misaki Asano • Mekuru Katsuragi|
|Future Foundation||Kyosuke Munakata • Kyoko Kirigiri • Ruruka Ando • Sonosuke Izayoi • Makoto Naegi • Byakuya Togami • Yasuhiro Hagakure • Aoi Asahina • Toko Fukawa • Ultimate Make-up Artist|
|Serial Killers||Momomichi Ito • Rei Shimizu • Eiichiro Saiyama • Ted Chikatilo • Kenji Tsuruhashi • Mimiko Tomizawa • Shuji Fujigawa|
|Ultimate Despair||Junko Enoshima • Mukuro Ikusaba|
|Minor Characters||Yujiro Ida • Yoshihiko Hayashi • Koichi Ogawa • Osamu Yamada • Hana Niyama • Kozumitsu Inaka • Ikumi Gozo • Shinya Ikemoto • Kinari Kunugida • Kanta Tsunada • Chusuke Oyama • Sakuma Fujii|