http://static.tvtropes.org/pmwiki/pub/images/666_Satan.jpg
[[caption-width:189:NO! For the last time, it's not a ''{{Naruto}}'' ripoff!...It's a ''Anime/NeonGenesisEvangelion'' ripoff with ''Naruto''-[[{{Expy}} esque]] characters!]]

Written by Seishi Kishimoto, younger twin brother of MasashiKishimoto -- yes, ''[[{{Naruto}} that]]'' Masashi Kishimoto -- ''666 Satan'', retitled "''O-Parts Hunter''" in the North American release for rather obvious reasons (though otherwise a faithful translation), is about Jio Freed, who, after joining up with a girl named Ruby Crescant, starts searching for artifacts of an ancient civilization, called "O-parts", so he can [[ToBeAMaster take over the world]].

And Jio has Satan sealed inside of him.

The series gained a bit of controversy in Japan as [[{{Follow The Leader}} many readers accused it of being a blatant ripoff]] of ''{{Naruto}}''. Being the [[strike: younger]] twin brother of the author of that series didn't help matters. It got so bad that Masashi had to step in and pretty much tell everyone that wasn't the case and that both brothers just had the same influence (i.e. ''DragonBall'') for their works.

This was Seishi Kishimoto's first series, followed by ''BlazerDrive''.

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!!''666 Satan'' provides examples of:

* AllOfTheOtherReindeer: Which is Jio's driving force for his world domination goal.
* AnIcePerson: Shuri.
* [[spoiler: AssimilationPlot]]: [[spoiler: Amateratsu Miko's ultimate plan, before being hijacked by Satan]].
* BerserkButton: Do NOT say God's name in vain around Cross. He will ruin you.
* {{BFS}}: Kaito uses one that can change its weight in his first appearance, but it gets broken.
* {{Bishonen}}: Cross Biancia.
* BigBad: Averted. Several villains would ''like'' to be the BigBad, but none of them can be held responsible for everything, nor could they have become what they were without the O-Parts, Recipes [[spoiler: or [[CoolAirship S]][[ApocalypseHow h]][[ArtifactOfDoom i]][[NeglectfulPrecursors n]]]]. [[spoiler: Beelzebub and Satan are the closest to the actual thing]].
* ButtMonkey: Ball
* BittersweetEnding + DistantFinale: [[spoiler:Jio is able to defeat his Satan side and save the world from the Shin ship but he, along with the other Kaballahs (Ruby, Zero, Jack and Cross), teleport it into space with them on it, destination unknown, in a effort to keep it from being misused again. The final page of the comic is a grown up Ball, married to Mei, telling this story to their two children.]]
* DarkIsEvil: Played with. Demonic Recipe Holders (eg. Jio himself) can be decent people. Unfortunately, this power is still evil and threatens everyone around them. Moral alignment doesn't determine Recipe compatibility, it seems...
* DualityMotif: Jio has one blue and one red eye, as well as half-and-half hair. This is mainly to symbolize the fact that he [[SuperpoweredEvilSide is a host to Demon 1i, Satan]].
* EldritchAbomination: In spades: every single demonic or angelic recipe is an Eldritch Abomination of notable horror. The most normal-looking (in comparison to the others, at least) would have to be [[spoiler:Naamah, number 10i on the Reverse Kabbalah: it looks like a giganitc whale creature in which the main villains hold their base of operations.]] Some of them, mostly the angelic recipes, can be classified as {{Humanoid Abomination}}s as well.
* EyesAlwaysShut: Futomomotaru
* ExtraEyes: A few people of the Cyclops race can open a third eye in the middle of their forehead.
* FashionableAsymmetry: Jio's (and quite a few other characters') costume.
** Jio's costume comprises odd shoes (one is a white converse and the other a black school shoe) a black one side 'n' white the other top and hair. This is displayed to be a visual reperentation of his split personalty. Indeed when he goes 666 on enemies' asses his hair turns all white. In the 3rd part there is a scene where a black Jio (good) and white Jio (satan) are having 'words'.
* FloatingContinent: Roc Bird City, [[spoiler:built around the body of the demonic recipe Beelzebub.]])
* FreakyFridayFlip: Astaroth has the power to turn one thing into another, he was only shown using it to switch two people's bodies, and to make them very, very heavy.
* HeelFaceTurn: [[spoiler: Shuri]].
* HugeGuyTinyGirl: [[SpellMyNameWithAnS Kaito/Kite]] and Yuria.
* ImprobableWeaponUser: Many bizarre O-parts are shown, but the most notable one is Futomomotaro's Mackerel Sword. [[ExactlyWhatItSaysOnTheTin Which is exactly what it sounds like]].
* {{Kabbalah}}: Featured prominently throughout the series
* KillItWithFire: Jin's O-part uses fire-based attacks.
* KilledOffForReal: Unlike in other {{Shonen}} series, when a character dies here they stay dead. '''[[AllDeathsFinal Period]].'''
* KnightTemplar: Amaterasu Miko and Cross[[spoiler:; but he gets better after the 4-year timeskip.]]
* LightIsGood: Subverted. On the one hand, an angel's consciousness is [[IncorruptiblePurePureness literally pure goodness]]. Sandalphon ([[spoiler:Ruby]]) is TheCutie, Zadkiel ([[spoiler:Zero]]) is a {{Badass}} [[TheMentor Mentor]] and Metatron ([[spoiler:Cross]]) gets over his KnightTemplar tendencies. On the other hand, we have [[TheFightingNarcissist Michael]] and [[MoralMyopia Samael]]. On the ''other'' other hand, bringing together all ten angels will let Amatarasu Miko rule the world. [[KnightTemplar ...yeah.]]
* MarketBasedTitle: Viz understandably didn't want to deal with the protests they would have faced had they released this series in English with its original title, so it became ''O-Parts Hunter'' in the United States.
* MeaningfulName: His name is Ball and he loves spherical things and hates sharp edges. Pretty damn obvious.
* MorphWeapon: The O-Parts are notable for this. Even more so after the Time Skip.
* MulticoloredHair: Jio (again another side effect of his Satan side)
* MsFanservice: Ponzu. Period.
** ...[[FanDisservice until you notice]] that her StalkerWithACrush tendencies [[{{Shotacon}} began noticeably before Cross hit puberty]]. When she later tries to claim him, her argument is basically "[[InsaneTrollLogic He's seen me naked therefore he's mine]]."
* NumberOfTheBeast: Satan who is the Recipie Jio hosts [[spoiler: eventually revealed to be the other way around]]
* OneWingedAngel: When the Kaballah holders go to their true forms.
* PeoplePuppets: One of Beelzebub's powers.
* PrettyFlyForAWhiteGuy: Ball, to an extent. Combined with the dreadlocks, if one were to avoid looking at any color pages, they could go the entire series and not realize that he's not actually black.
* PureIsNotGood: Hoo boy ''howdy''. An Angel's power shields its owner from the evil in their own heart. In the case of a genuinely evil person, this means [[KnightTemplar they cannot recognize their own depravity]].
* RaisedByWolves: Jio, for a time. A talking wolf who's bones are O-Parts, but still.
* RummageSaleReject: Jio
* {{Satan}}
* {{Stripperiffic}}: Ruby and Panzu after the TimeSkip. And Anna from the Roc Bird arc.
* SealedEvilInACan: Jio with Satan might look like this, but [[spoiler:Jio is actually a personality that was forced off of Satan and had priority control of the body they shared.]]
* SiblingYinYang: [[spoiler:Kirin and Kujaku are twins. Kirin inherited the Cyclops third eye from their father, Kujaku inherited the O.P.T abilities of their mother. Kirin is good, Kujaku is evil. Do I have to go on?]]
** Although in flashbacks it appears that they weren't so different after all...
* SuperpoweredEvilSide: Jio/Satan
* TakeOverTheWorld: Jio's ultimate goal, though he's a lot more benevolent than other characters with similar goals.
* TalkingAnimal: Zero [[spoiler: justified because he's actually an Angel recipe]]
* {{Tearjerker}}: Quite a few here and there but the most heart wrenching being [[spoiler: when Jio finds a couple who think of him like a son, and being parentless this is a big deal to him. At one point the get into an argument and Jio run off. He eventually cools down and goes to apologize but the baddies have found them and killed the couple in cold blood.]]
* TimeSkip: Two actually: a somewhat subtle one from child to pre-teen and another to teenager.
* TookALevelInBadass: Almost everyone after the timeskip
* TournamentArc: Sponsored by [[spoiler: Beelzebub]]
* TrademarkFavoriteFood: Kirin loves his pickles.
* WildChild: Jio was trained for several years by a [[TalkingAnimal talking]] wolf -- possibly as close as he came to having a parent.
** [[spoiler: Until he meets up with a couple that is]]
* WordsCanBreakMyBones: Spika has an O-part that makes the words she says into it materialize into actual words that act like or are made out of their meaning.
* TheWormThatWalks: Beelzebub
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