[quote=@Dead Cruiser]
<Snipped quote by Lord Wraith>

A teenage character undergoing a transformation into some sort of alien monster. 
[/quote]

Was it a symbiotic/parasitic relationship like Star Lord's sheet or was it more of a 'they had always been an alien, just weren't aware of it' deal. The latter could be quite different and even similar origins can come across as completely different characters provided their abilities, personalities and backstories have enough variance.