Ghost

History
Ghost is the manifestation of the portion of soul the Ghost Gundam absorbed from Marcus Reval. Originally this was done as an attempt of the advanced self learning A.I to rapidly advance itself by taking in a piece of humanity. This lead to the development of a personality and conciousness that was later dubbed Ghost by Marcus.

Upon creation, Ghost immediatly designated Marcus as the sole pilot of the Ghost Gundam via the Spirit+ program. This meant that only Marcus could activate the machine and unlock the hidden abilities stored within the Spirit+, for better or worse.