User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-4802891-20170727204532/@comment-4802891-20170814045045

Ding ding ding!

Correct! Alter-ego of Disguise is Tokugawa Ieyasu's political decoy Sarata Motonobu, also known as Sakai Joukei. However, on screen, he still appears as Tokugawa Ieyasu. His true Class is Faker, of which he only keeps a skill.