A very nice rendition of the character, an amalgamation of several anime influences. The movement seems swift but deliberate, the line work is fine with some nice details like the armored sleeve under the traditional cloak. To be honest I would have preferred to see something with more color to give this powerful being more presence. The original artist has done a nice job with this as it appears to only be like a simple sketch or concept art to show how the character should look and perhaps a more detailed rendition can be posted in future, perhaps even some of the other characters in the book as well.
Well the story itself is great, but you overdo the abilities, if your opponents are stronger I don't see how your guy is as powerful as he is right now. Even if he a demigod or something like that he's only so powerful. No matter how strong one man is he's just one man and there will always be someone who is stronger. I think you need to add in a time where he doubts himself and trains. Nevertheless it's a good story so far it's just the abundant of abilities and powers you give, it would only seem fair to have your enemies with similar things.