Gideon (time vault)

Gideon is a sentient computer used by Eobard Thawne. It is hidden in Dr. Wells' secret room inside S.T.A.R. Labs.

Biography
Dr. Wells used Gideon to record and catalog his notes about Barry Allen since he was struck by lightning and his heroics as "The Flash" ever since. He later used it to search for the Flash in future newspapers after his abilities were repressed by Blackout, to no avail. After Barry regained his abilities, Gideon was able to find the Flash in an article from 2024, reporting his disappearance in the crisis.

Sometime later, Gideon recommended that Harrison Wells stop using the tachyon device to absorb the Speed Force, but he wished to elevate the absorption to maximum.

Trivia

 * It seems like, with how they talk to each other, that they're actually friends.