Seraphina

set in a post-apocalyptic future where a large amount of mankind has been eliminated by giant demons from the stars. A young girl named Seraphina upon running from the demons trips and stumbles upon an old lavatory and uncovers you a A super robot known as a Brave. a machine that has a heart and soul of your own. Upon activating she is instantly registered as your master and owner, seeing this as Humanities Last Hope. She requests for you to help eliminate the demons plaguing the world. You can choose your abilities, weapons, and qualities as a Super Robot. You're only a main directive is to protect her; everything else is your choice. Also, the robot never received a name, so go ahead and name yourself.