Tuare's dead eyes changed when she ate, the first time someone did something nice for her. You wanted to know about Sebas and his power, this arc will answer that Sebas' flex coming up, stay tuned.
Sebas is the opposite of Demiurge in many ways like their creators. Sebas and Demiurge represent how each of them wanted to be. Touch me wanted to be a white knight who brings absolute justice (which he couldn't do IRL) and Ulbert wanted to bring doom to all corrupt governments and rule the world as a villan (Which he died trying to). I love both of them but I love Demi a bit more because of his refreshing character and design that reminds me of Alucard (in Hellsing ultimate)
9:40 Regarding your comment regarding Sebas’ programming, his creator, Touch Me, barely put anything in at all for that, so as a result he takes much more after his creator in this world. I believe that’s how it went.
I mean, the Fingers were done from the moment Nazarick(Demiurge) became aware of them. The business with Tuare was just a bonus in that regard. (nevermind that the idea to take over the city underground might not have originated within Nazarick... :)