Data.
That would be a good concept for a construct. A super intelligent AI robot. Let him look completely human but give him some aspects that could compel his robot status:
"Complexion isn't quite natural" (which he could cover up with deception when it matters)
"Still learning social etiquette"
"Innocent as a child" (Unless he wants to be the Evil Data. That would be cool too.)
IF he does something like that, then there's good opportunities for compels in social settings, and since data is a "sentient" AI who learns, he could gradually change those aspects as he learns to fit in to society.
I also like the idea of the living dead power. He'd need to be repaired in order to heal.
A robot in the Dresdenverse? Where any mortal with a bare flicker of talent can look at you and go
"poof" and you're out of commission? Seems like a supremely terrible idea to me.
You'd have to be animated strictly by magical means.
