アイゼーア・ナージ

First of the imaginary children.
He hacked and stole from eXarch's bank account to fund his own electric brain operation and his trip to Japan in order to meet with Ereshkigal. Was caught and prosecuted, then locked to eXarch's research facility. 

Fed up with prison like life, he uploaded his consciousness to internet, then killed his body by frying his brain augments. Isaiah became the legendary hacker "He" after saving Shinozuka Mayumi from coma./