If there is an evil twin, do you think it's our Ciel or the Real Ciel? I came across the 'evil and good twin' trope the other day, and I don't think it's what Yana is going for... but now I can't stop pondering it! I'm inclined to believe that due to Sebastian's influence, our Ciel is more "evil".
It’s hard to say at this point since we don’t know that much about real!Ciel’s personality yet. I mean, if the theory that the shooter was real!Ciel was true, then it would mean that he has changed from this
We don’t know whether the ruthlessness with which he shot Soma and Agni is his true nature or if his personality was possibly manipulated by someone.
Though either way, considering that they were (most probably) both Vincent’s children, I think both of them might have had the potential to become “evil” to some extent^^;