If it cost me who I am, it wouldn't be me with those powers, but someone else. The fact that there would be a continuous line of consciousness between me and that other identity is trivial when taking into consideration that, ultimately, I already am everyone else including those that have powers beyond believable reality (we are all one). Even beside that, I don't think I'd want to sacrifice who I am. Anything I could gain from it would be pointless. Depending on exactly what it means that it would cost me who I am. As for emotions, I already don't have any.