Did anyone else know about this? 666 Satan is a manga by Masashi Kishimoto's younger twin brother. Apparently talent does not run in their family because it was all I could do to read through the first chapter. The style is very very similar to the Naruto Pilot chapter, only worse. So yeah, It's pretty bad.
The characters are pretty shallow - the main character, Jio, is a Naruto/young Goku clone who suffers from the same isolation that Naruto dealt with early on. The other main character, Ruby, is annoying. The story is pretty weak in its execution:
*Ruby meets Jio*
"Hi, what's your name?"
"Jio"
"I'm Ruby. My dream is to become the world's greatest treasure hunter*
(who gives a shit??)
Parts of it remind me of a poorly made videogame (the characters are just excuses to talk about how things work in the world), and the whole thing does not have "success" written all over it. Or anywhere on it, for that matter.
In any case, I still thought it was cool to read just because the brothers' art styles are so similar. Worth taking a look at, if only for that. I suppose it could get better and possibly become pretty good, but I don't see a lot of potential.
Here is a link where you can get chapters 1-22 (dunno if that's all of them)
http://www.directmanga.com/series/666satan.html