User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-28209103-20170412091247/@comment-28209103-20170412162550

Correct, it's naked snake

And the song I hummed naturally is snake eater XD

some of the skill mentioned :

Snake Eater B : Increase damage vs Dragon(serpent) enemy

Revival Pill A : revive self with 1 hp one time

Giant Mech Slaying B+