The first 10 or 20 chapters of this manga will be filled with similarities between scenarios and concepts to Naruto, with moments that I can't quite understand if they were plagiarized from Naruto, or just a simple homage. From the protagonist, Jio Freed, who was bullied by other kids his age, who doesn't have fathers, who has an absurd dream (that of course will be achieved by the power of determination and friendship) and even to the concept of having an evil monster residing within him, the similarities are just too many. And that's just mentioning Jio. Like, did I mention there are numbered beasts just like the Juubi that are being gathered by organizations??? Like the Akatsuki??????
STORY: A typical, generic shonen plot that spans from the protagonists childhood to his adolescence/adulthood, depending on when he defeats the antagonist. A plot that really doesn't go anywhere until a timeskip happens around the later half of the manga, which by then would have been like 30 chapters in (which seems a small number, but take into account that most mangas have 20 pages per chapter, 666 Satan has 40-50 pages per chapter). Of course, it starts from a very grounded standpoint until the story absurdly scales to a planetary level and then a universal level. A Truly ridiculous plot with nothing remotely interesting going on, even if the concept managed to be interesting, it doesn't manage to draw you in and make you care at all.
ART: HORRENDOUS. It gets better nearing the end, which shows the mangaka actually made a progress on his drawing skills. There are some really nicely done action panels and dynamic poses, but they're not worthy considering most of the art on these 76 chapters is down right bad.
CHARACTER: None of them are interesting, none of them will make you care about them or what happens to them, most of them aren't even likeable. Badly designed characters (With the protagonists looking like deviantart OCs) that are truly displeasing to look at. One dimensional personalities, the only thing they do is are preach about friendship and promises and the power of the heart. The best characters this manga have are Kirin sensei (with his design being an amalgamation of Jiraiya and Kakashi????) and... none other, honestly. Antagonist keep popping up out of nowhere with poor attempts at plot twists that are laughable. Not a single villain actually felt like one, considering how little development they got.
ENJOYMENT: The most subjective aspect of any review, enjoyment.
I must admit, my enjoyment of this manga was totally fucked by the scanlation teams who, without having good scans, nor editing and translation skills, decided to take on 666 Satan. Of course, this isn't the mangakas fault at all, I'm just saying that your enjoyment of this manga will be absolutely affected to whether you read it officially or you pirate it. Leaving external factors aside, the only enjoyable thing this manga has to offer are some cool panel and double pages art in the final chapters and that's it. Every chapter being 40-50 pages made me enjoy this even less.
Overall: I do not recommend this manga to anyone, not even hardcore shonen fans. I'm shocked to see such positively scored reviews on this manga, but the fact that they were written in 2008 has to be taken into account. I wonder if the people who gave this a 7/8/9/10 back then would think the same on a reread.
