User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-4802891-20170526200433/@comment-4802891-20170527185045

Actually no, the NP is from the Hero. Sorry if it wasn't clear enough. I'll edit this part slightly and hopefully it will help.

For the 3rd skill, let me just say that if the Hero was summoned by conventional means, it would be a constantly active Noble Phantasm, with a very undesired effect that would make him weak against another potential Servant.

He also has another skill I wasn't able to put in. It could be a huge hint so I won't disclose it just now. Try asking more questions^^