Tsukasa Okino (Mystery Files)
For the main page regarding this character, see: Tsukasa Okino.
Tsukasa Okino is a young genius with an extremely high IQ. Starting with the Sentinels, he developed various technology to aid the defense corps. Driven only by his intellectual curiosity, he tends to act on his own terms, regardless of what other people think. In 1944, he presents as a girl and goes by the name Kiriko Douji.
In order to prevent the kaiju from destroying world, Okino searches for whoever is sending the D-Code signal that calls the kaiju.
Since he had used DD-426 on himself in an attempt to detach the D-Code, he wasn't affected by The Sentinel Infection Incident in 2064. Although he lost his memories from from detaching the D-Code, no one could tell the difference between the original Okino and the current one. This was because he preserved his memory in his nanomachines, and ensured the simulated personality that makes up his identity would be affixed to his brain.[1]
Back in 1944, when Okino called himself Kiriko Douji, he operated on Takatoshi Hijiyama and Keitaro Miura to ensure their synchronicity with the Sentinels. In doing so, he implanted a linking component into their heads.[2]
Although he dies in Universal Control due to an android attack[3], he's still able to communicate with Hijiyama inside Sentinel No. 12.
While the Sentinels couldn't be activated due to the effects of DD-426, Okino got them operational again by creating a code that reconstructed the nanomachines to nullify the effects of DD-426. He then applied the code to Miura (Sentinel No. 19), which led to the completion of the Sentinel activation data. Furthermore, he made it so the completed data would spread to the other pilots as long as they come into contact with Miura.[4]