#6 Mr. Immortal it is

Is it getting any harder?

I have two bodies, and one sleeps.

I'm a loner, but have at times had friends who I go to war with.

My other self is alien and and the stuff of nightmares.

I have been out of sight for a while, but a good writer saw my potential and that's a relief.

At least I'm not Slapstick, but I'm still a loser in most eyes.