Fine... I might as well make a list of the main 13 characters of my project so you can see how and when I'm going to introduce them. Spoilers ahead!

1. Tamashii - leader of the Angelic Guardians, appears in Book I, first arc.

2. Yorokobi - second Angelic Guardian found by Tamashii, appears in Book I, first arc.

3. Ai - third Angelic Guardian found by Tamashii and Yorokobi, appears in Book I, first arc.

4. Oujou - fourth Angelic Guardian arrived during demon battle, appears in Book I, second arc.

5. Inochi - fifth Angelic Guardian that lived inside Oujou until they were finally separated, appears in Book I, second arc.

6. Seijitsu - sixth Angelic Guardian that was a target of the Dark Demon Myoujou, Tamashii's de facto leader of the group, appears in Book II.

7. Ryou - seventh Angelic Guardian arrived during demon battle, appears in Book III.

8. Heiwa - eighth Angelic Guardian arrived during demon battle with Ryou, appears in Book III.

9. Jihi - ninth Angelic Guardian found by Seijitsu, appears in Book V.

10. Onwa - tenth Angelic Guardian arrived during demon battle, appears in Book V.

11. Shinbou - eleventh Angelic Guardian arrived during demon battle, appears in Book V.

12. Iryoku - twelfth Angelic Guardian arrived during demon battle, appears in Book V.

13. Nikusa - the only Demonic Guardian of the group, created by Myoujou to destroy the Angelic Guardians, appears in Book VI.

And now for the supporting characters (includes villains):

1. Kami - the supreme deity in Heaven that guides the Angelic Guardians, appears in Book I, first arc.

2. Myoujou - the Fallen One that rules Hell and tries to overthrow Kami, mentors Nikusa, appears in Book I, first arc.

3. Geiburieru - the archangel who mentors Tamashii, Yorokobi, Ai, Oujou, and Inochi, appears in Book I, first arc.

4. Maikeru - Geiburieru's dark and rebellious brother who mentors Ryou, Heiwa, Seijitsu, and Jihi, appears in Book IV.

5. Geiburiera - Geiburieru's twin sister who mentors Onwa, Shinbou, and Irokyu as well as acts as their manager, appears in Book V.

Others:
1. Seijitsu (wolf) - Seijitsu's magical familiar, protector of the dreams of the innocent, appears in Book II.

2. Leviathan (sea dragon) - Nikusa's magical familiar, once was tamed by Kami but now is controlled by Myoujou, appears in Book VI.