Raggie's Backstory

So, a spaceship crashed. It was recovered and studied. The alien inside was pronounced dead on arrival. So they decided to try to resurrect it by any means. Some nanomachines here, some zombie virus there; they got it moving and reacting to its environment at the very least. They reprogramed it to speak English, but the creature either wasn't intelligent to begin with or was stricken with amnesia somewhere between the dying and coming back to "life", as it wasn't able to tell them anything about its past.

Physically, it was pretty much goo in a stretchy bag, though the nanomachines could form temporary solid structures if needed. Its colorlessness is from being dead, it seems. It figured out it can shape itself into pretty much any form it wants; whether that was a preexisting ability of the kind of alien it is or the result of whatever they did to is is unknown. The apparent "stitching" is actually the goo poking through and holding things in the desired shape. The creature's skin can tear open and heal back together quickly and this doesn't appear to hurt it.

There was a sort of facility to keep "weird stuff", and this zombie-alien-cyborg qualified as "weird". It eventually got bored and started sneaking out. It realized that most people weren't too fond of its amorphous base form and started to regularly take on a more humanoid shape. It also would wear a cartoonish overcoat and sunglasses as a disguise. At some point it met two other characters, Hex and Astrid, who happened to have superpowers. The two call the alien Raggie since it didn't have a real name before. Raggie becomes enamoured of the idea of superheroes and comic books and convinces Hex and Astrid to form a team with it. The three buy a place to move in together which they refer to as their team base. Raggie somehow also persuades those in charge at the facility it was kept at to allow it to move out and to contact the team if there's anything they can't handle.