This is my friend's character Sam. I wanted to sketch something and didn't think it would turn out this good.

This is his own description.

Long ago, there was a metropolos city when vast technologies were running. One doctor who created robots who serve the people create SAM to protect the city. She was never activated tho. One day the city was attacked by a fiend and killed all living creatures alike. over 1,000years later SAM awakes to a city that has been covered over by a forest. Because of her artificial stature, She had to. Learn everything herself. The fiends had grown in numbers over the years and are still attacking, not many humans are left. She needs to leanr her abilities and relize her Obigations before all is lost. Its up to her to save the day.
Her energy source is the surrounding energy of the world, and all life on it and such. So you and say her "skin" works as an absorbant of such. It's compressed/condensed -so- much that it forms into a liquid, a liquid life-force of such. You could imagine it to be like a neon blue color even, your choice. But yeah, She was built to store said liquid energy in her chest? An excuse she as breast and why they are so large, her time spent not activated incidently gave her time to passively collect without control, and thus the storage area (her breasts) expanded a bit.
I'm sure in the story guys will be starin at her, and girls get be mad/jealous/angery and such.
In short shell have a difficult time socializing with humans...
or they wont trust her cus of the mechina that has killed so many humans in the past, she'll have to prove herself to them, which might cost her her life!