I chose not to and to serve him. Nothing bad really happens and it doesn't interfere with the Orc war event. Though make sure ur sanity level is above 100, otherwise when you do the lewd scene with him, it's game over. Not literally.
Yes he came to me, he emerged from the pool water when Orgam fainted.At that time I made my charisma points more or less 25 points to pass the charisma test. He wanted to share information about the orc war situation,Will the nameless person appear again in the future?
Yes and it's when you save Groth from Khalgor. Nameless will appear at night and you get to have sex with them. He even offers to control Groth and they both fuck you, though I chose not to involve Groth.