Watcher God

When I heard that my parents died, I was joyful. Ever since I was young, I could never express any emotions, but I could feel them. I know I can. When they died, I showed something on my face for the first time: a big old happy smile.

Having enough, I went and summoned a demon from the book the old lady got me. When I first summoned him, he was a pain—a very annoying pain—that I couldn't get rid of. But I had to put up with him since he said he would teach me magic.

And so I made a deal with him. He put me through many hardships. I had died many times because of him. And his stupid deal. What was his deal, you ask? It was to defeat Lucifer, one of the rulers of hell.
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Please note the ones in the cover are the villains of arc three.