User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-30314236-20170310191146/@comment-27971189-20170311162114

Its quite hard for me as I don't remember if there is any agile, mysterious person, with lawful good alignment that can be classified as Assassin on Britain lore.

Looks like this guy is from minor lore as most Britain major lore are about knights.