Itaru Hashida (橋田 至, Hashida Itaru) is an experienced hacker in both software and hardware technologies. He is also well-versed in things pertaining to otaku culture. Okabe and Mayuri call him by the nickname "Daru". In chapter 6, it was introduced by Mayuri that if you said "Hashida Itaru" ten times, the pronunciation of "Titor" would appear, which explains why he goes by the name of Barrel Titor in 2025. He is Lab Member 003, having joined before the events of the series.