O-Parts are powerful items that is used in every day life, from weapons, transportation to tools in this world. This story is starts off with `Jio Freed` an OPT (someone who can use O-Parts) and moving on to reveal that he also happens to be an O-Part called Satan 666.
Standard save the world story, nice story build up in the beginning. Good storyline, a little twist in the end.
By Seishi Kishimoto (666 Satan)
Post-time skip, the characters can be divided into three major factions:
Main article: List of O-Parts Hunter characters
Crew of the Ophan
The main protagonists of the series. They are stuck in the middle of the fight between the Stea Republic and the Zenom Organization because several members of the group are Sephiroths, and that each group is searching for the legendary O-Parts.
* Jio Freed
* Ruby Crescent
* Cross Biancina
One of the two main antagonists of the series, they are the corrupt government who is led by Amaterasu Miko.
* Amaterasu Miko
* Dofuwa Longess
* Mishima Kagesuge
An 'underground' organization with the goal of getting rid of the Stea Republic, they are led by Jack Crescent.
Commander in Chief
* Jack Crescent
The Four Guardians
* Mr. Franken
* Wise Yuri
Angels and Demons
Main article: O-Parts Hunter Angels and Demons
Throughout the entire O-Parts Hunter universe, there are angels and demons (some of which are sealed within humans) with amazing powers, all of which are being searched for by the Stea Republic (angels) and the Zenom Organization (demons) in order to awaken what is assumed to be a weapon within a Kabbalah and a reverse Kabbalah that are found on the North and South Pole respectively.
As of the beginning of the time-skip all but four Angels have yet to be inserted into the Kabbalah, those four being Metatron, Zadkiel, Samuel, and Sandalphon.