His powers are a unique twist on shapeshifting. Is he from the kind of world where some people randomly get superpowers, like through maybe genetics? Or did he get it somewhere else? How did you come up with the entire concept of changing as long as he has DNA and a power supply, and especially how he can combine DNA to make a new person (I like that!)?
Ironically, when I first made Smiley I didn't want him to be a killer because I had too many OCs of those lol. He was meant to be just a mysterious but jolly guy, but when I revamped him, he was insistent on being who he is now. When he was put in Toyhouse, his style of talking and his calling card of drawing smiles out of blood came to my mind a little after playing him in the forum games. It wasn't necessarily specific characters that got him that way, but the idea of HOW he'd interact in something short like a forum game.
Perhaps, though, the most interesting thing about Smiley's change was his personality. When he was first created he was jolly, yeah, but more fatherly and a little sad? When I started RPing THIS him, he was meant to not really have a personality- he'd show up to kill, maybe make a joke, then would disappear before you could really get an idea of him. But because of the bad experiences attached to RPing with him, he was more or less cruel and aggressive instead of silly. When I made the friends I have now, they would come up with fun scenarios involving Smiley, and I adored all of them! We talked more and more about these scenarios until his personality evolved from cold to scary yet friendly. I think it was that that also helped come up with his killing methods and his calling card.