"Thou art I, and I am thou... From the sea of thy soul, I come... From the very moment of my emergence, I have been a guiding light shed to illuminate thy path... I am the original god... Izanagi-no-Okami."
"The Father of all in Japanese myth, as well as the ruler of creation. When forbidden to see his wife Izanami, he broke the promise, resulting in the two being separated from each other forever."
—Persona 4 compendium
The ultimate Persona of the protagonist, Izanagi-no-Okami can only be accessed in the events of the True Ending, which can be unlocked provided if the protagonist manages to choose the correct choices.
In the True Ending, the protagonist realizes that Izanami is the true mastermind behind the bizarre murder cases, and ventures into her reality within the Midnight Channel, Yomotsu Hirasaka, to put an end to her plans. Eventually facing Izanami, however, the protagonist and his comrades are engulfed by Izanami's Thousand Curses. Fortunately, the protagonist hears the voices of his friends, telling him to continue fighting on.
Accumulating the powers and bonds he forged, the protagonist channels the powers of his Social Links to his initial Persona, Izanagi, transmogrifying Izanagi into his true form, Izanagi-no-Okami. Enduring all of Izanami's assaults, the protagonist takes off his glasses, and ultimately summons Izanagi-no-Okami, ending Izanami with one powerful strike, Myriad Truths then free his comrades after the battle.
Unique from other Personas, Izanagi-no-Okami is the only Persona of The World Arcana, and while he is summoned in the final battle with Izanami-no-Okami, Izanagi-no-Okami can be summoned during a second cycle and only by achieving the game's True Ending in the previous cycle. However, as loading the data from the previous cycle technically resets the protagonist's Lv. back to 1, Izanagi-no-Okami can only be summoned once the protagonist retrains back to Lv. 91. Also, as the World Arcana is a standalone Arcana which is not represented by any Social Links, Izanagi-no-Okami does not receive any bonus EXP upon being summoned. Izanagi-no-Okami cannot be registered into the Persona Compendium nor fused with any other Persona. This however, has been slightly modified in Golden, where Izanagi-no-Okami can inherit any skills from his predecessors. However, he is still unable to be stored in the Persona Compendium for later summoning and will require fusion once again to make.
While Izanami's fabricated goddess form bears a resemblance towards Izanagi-no-Okami, having a white-ish color theme, her true form, Izanami-no-Okami takes the form of a rotting, death-ridden form, similar to the Japanese mythology.
Izanagi-no-Okami, along with Palladion, returns as an Instant Kill. Similar to Pallas Athena, Izanagi transforms into Izanagi-no-Okami for Yu Narukami's fatal attack. Like Palladion, however, Izanagi-no-Okami cannot be accessed by his host outside his Instant Kill, Myriad Truths.
Immediately after both the P3 hero and P4 hero reach level 55, the request, The Power of the Wild Card, becomes available. The request for just the two Heroes to fight Margaret in You in Wonderland Chapter 3. Immediately after the fight, Orpheus evolves into Messiah and Izanagi evolves into Izanagi-no-Okami. Due to the two Wild Card users being brought together, similar to everyone being able to equip two Personas, once the two heroes attain their ultimate Personas, everyone else is able to as well, with their Personas evolving once they reach level 55. Each ultimate Persona only has one skill unique to it, Izanagi-no-Okami's being Heat Riser, which greatly raises one ally's attack, defense, hit and evasion for 3 turns.
Izanagi-no-Okami is a DLC Persona, available as part of the Persona 5 Royal Persona DLC bundle which also includes Raoul and Athena for $9.99, and comes in both his regular form from Persona 4 and a Picaro variant. Both variants appear as the sole Personas of the World Arcana, and cannot be fused with other Personas, but can still be used with Gallows and Electric Chair fusion. In addition to being able to be summoned from the compendium, both variants can also be obtained via Advanced Fusion.
Izanagi-no-Okami's unique skill is "Myriad Truths," which deals three hits of heavy Almighty damage to all foes, making it one of the most powerful attacks in the game. In addition, his unique trait is "Country Maker" which increases his attack and defense based on the protagonist's Persona Compendium completion percentage; at 100%, damage dealt is doubled and damage taken is halved. Itemizing him via the Electric Chair yields the Shining Headband, which boosts all stats by two points and bestows the Invigorate 3 skill. During a fusion alarm, he instead yields the Shining Headband R, which adds three points to each stat as well as granting Invigorate 3. The Picaro variant yields a Mediarahan skill card normally, and a Salvation skill card during a fusion alarm.
Unlike the ultimate Personas of the protagonists from the previous series, Izanagi-no-Okami holds the largest fusion prerequisite to summon. Apart from completing the True Ending event in the previous cycle, the protagonist must also perform a Dodecagon Spread Fusion in the Velvet Room (which becomes available July, 11th) with specific Personas to summon Izanagi-no-Okami:
In Japanese, the skill "Myriad Truths" is literally translated as "Many Myriad's True Words" (幾万の真言, Ikuman no Shingon)?, and Izanami's skill "Thousand Curses" is actually "Many Thousand's Curses" (幾千の呪言, Ikusen no Jugon)?. The two skills most likely parallel Izanami's curse and Izanagi's vow in the original Japanese myths, where Izanami swore to kill 1,000 mortals a day and Izanagi countered by vowing to give life to 1,500 mortals a day. "Myriad" is also an archaic word meaning "ten thousand."
While using cheats to get the full compendium in Persona 4, there are 5 extra slots in the compendium: 034, 0B4, 0B5, 02B (these four slots are in the Fool Arcana) and Izanagi-no-Okami. His slot is the very last one right after the Judgement Arcana, and it is labeled "World," he starts out at level 0 and he has his own info. However, he still cannot be updated.
Yu's ultimate weapon, Blade of Totsuka, bears close resemblance to Izanagi-no-Okami's weapon.
Izanagi-no-Okami appears to be wearing a suit and tie, whereas Izanagi seems to be wearing a shirt and open jacket, much like the Yu's fashion of wearing his school uniform; this could be symbolic of "growing up" from a student to a serious worker.
In Persona 5 Royal, its name is written in Kanji instead of Katakana.
In Persona 5 Royal, Izanagi-no-Okami is infamous for being a "Balance Breaker" due to its incredible resistances, elite-tier stats and movepool, an incredibly powerful Persona Trait, and most importantly, access to the incredibly powerful Almighty Attack "Myriad Truths" which allows it to OHKO or 2HKO nearly any enemy in-game while ignoring resistances. Furthermore, due to being a DLC Persona, it is accessible during early game and can be summoned for free for the first time.
In Persona 5 Royal,Joker's line when using Myriad Truths is either "全て晴らしてやる"(Romaji: Subete harashiteyaru. En: All will be revealed) or "幾万の真言を信じて" (Romaji: Ikuman no Shingon wo shinjite. En: By the myriad truths/ I believe in the myriad truths). These two lines are based on Yu's lines in the Persona 4 Animation "それを邪魔する霧は、俺が全て晴らしてやる" (Romaji: Sore wo jama suru kiri ha, subete harashiteyaru En: I'll dispel the fog that covers our path) and "その先にある幾万の真言を信じて" (Romaji: sono saki ni aru ikuman no shingon wo shinjite. En: I believe in the myriad truths ahead of us)
Izanagi-no-Okami is the only playable Persona to bear the World Arcana in the main line games since its debut in Persona 4. (Messiah in Persona Q Also is from The World.)