Name - Phoebe Jones and Sraif (Sr-ay-ff)
Alias - Symbiont ("An organism living in a state of symbiosis".) 
Age - Phoebe is 24. Sraif's age is unknown, but she claims to be an adult. 
Powers - Phoebe is an ordinary human with no powers. All of her "powers" come from Sraif and "her" ability to amplify the host's natural abilities. Her powers include heightened sight, touch, smell, and taste, heightened reflexes, heightened strength and speed, near-perfect memory (which is actually just Sraif "flipping" through Phoebe's memory like a book) a high resistance to pain, and a telekinetic/energy shield around Phoebe. Sraif and Phoebe are connected telepathically, and Sraif can communicate to others with telepathy while out of Phoebe's body. 
Weaknesses - Electricity--it can kill Sraif in a second. Also, Phoebe's left ear is useless--that's Sraif's way in and out of her head. 
Personality - Phoebe's energetic, a joker, and loves to compete. Sraif is calm, collecting, and honest. (An "old soul", Phoebe says.) 
Appearance - [hider=Sraif][img]http://media-cache-ec0.pinimg.com/736x/3d/e4/20/3de42064a167bc775add39b87b0dff83.jpg[/img][/hider]
[hider=Phoebe Jones][img]http://s8.favim.com/orig/72/beautiful-blue-eyes-brunette-fringe-Favim.com-689841.jpg[/img][/hider]
BRIEF Bio - Phoebe was an average Psych major at (INSERT LOCAL PUBLIC COLLEGE NAME HERE) when the latest weird catastrophe happened. A piece of "space junk"--as the local media deemed the unrecognizable hunk of metal--crashed in a nearby lake. A good bit of water turned to steam and created some hot fog on campus. Of course, everyone ran out of their classes to see what happened. In the chaos, Sraif managed to swim out of the lake and take over the body of a stray dog. Using the dog as a hiding place, Sraif escaped the "scene of the crime" and ran into the city. Phoebe and Sraif's paths crossed many times, until Sraif took her chance and leapt from the dog's ear to Phoebe's. She forced Phoebe to sleep and told her everything; that she fell out of orbit while observing humans for her thesis (Sraif was working towards a degree in Exobiology.) and crash-landed on Earth, that her species could not survive on their own, and that the dog was an unsuitable host and she really did not want to force her will onto another being. In the dream-state, Phoebe agreed, and after a few shaky weeks of coexistence, they became best friends, and started to fight crime. 
Notes - Phoebe uses no weapons, and her costume is a red turtleneck, black ski mask (with holes for eyes and mouth), and sweatpants. She beats up criminals with her bare hands.

((Here's my CS. I found and edited a few mistakes.))