You're Maria, reborn using shadow's DNA as a base after your soul was found Eggman did this to gain leverage on shadow and use you to kill Sonic

Eggman: wakey wakey, Maria.

Meanwhile, Shadow was on a mission to stop Eggman from committing evil, he didn't know, that You, Maria Robotnik, his best friend that he missed for over 50 years, would be reborn

Shadow: tsk. What's Eggman fuck nugget doing. He continues to spy from the vents