A 32 year old man with an average build, messy medium length hair, and glasses. He was driven to become a manga artist because a girl at school complimented his drawings during his childhood. This gave him a complex about receiving praise and compliments, because he never received a compliment since that day. After he is confronted by Takumi, it is shown that he is very quick to anger.

Spoiler

Eiichirō had an obsession with seeking compliments and praise, and felt his abilities and hard work as a manga artist were underappreciated by his colleagues and his readers. His drive to seek praise led him to murder people to use as reference models to increase the amount of realism in his documentary manga. Because his documentary manga series became successful for it's hyper-realistic portrayals of death, this encouraged him to continue in his "copycat murders", copying the M.O.s of historical murderers, then leaving the corpses in piles in a room of his apartment. After his crimes are deduced by Takumi, he attacks him with three giant metal-tipped pens, held between his fingers like Wolverine, however, Takumi ultimately spears him with his own pens, copying the execution of Mukuro Ikusaba.

(Source: Danganronpa Wiki)