Yzak

Yzak is the Chief God and Sovereign of the Disaster Abyss World Evezeino.

Yzak acts according to his cravings and lives to satisfy his own desires. He is very eccentric and as whimsical as one can get. He is ferocious and wild but is self-aware of the fact that he's viewed as crazy. His do-what-you-want-to-do mentality is what makes him such an unpredictable wild card.

Yzak is both the Chief God and Sovereign of Evezeino, which is likely possible due to his unique nature as a half-god, half-demon. As a calamity that destroys the world on a whim, Yzak possesses enough power to be considered one of the Inviolable Waters. He led his world in numerous battles against the Holy Sword World Hayfolia, whose world and inhabitants were fundamentally different than his. Whereas Yzak and the phantom beasts were driven by irrational craving, Hayfolia's noble hunters were driven by irrational righteousness. Yzak battled its Sovereign, the legendary Holy King Ordov Heinriel, and gained a begrudging respect for him.

It's believed that he lost interest in the world a long time ago, and fell asleep since that was his strongest craving at the time, though he will awaken when someone that could stimulate his craving appears.

[Spoiler] The truth is that Yzak went to sleep after making a promise to Ordov. When Ordov realized Evezeino was alive and would move to devour Hayfolia, he tried blessing Evezeino with Eife's order, but Yzak drove them back. An injured Ordov would allow Yzak to take his head, questioning the path he took. He wondered if the Rainbow Road, which guided Hayfolians to hunt the phantom beasts, was really the embodiment of their conscience as it was told. If Hayfolia's blessing could quench Evezeino's craving, wouldn't it mean the same powers are at work? Then, were Yzak's cravings really his? If he was right, it would mean they were wrong all this time.

Intrigued, Yzak went to sleep in order to weaken Evezeino's order and stop its craving, giving Ordov the opportunity to find the true Rainbow Road and change Hayfolia. When he wakes up, the two could drink together if Ordov was right. Afterward, Ordov hid him in a temple in Hayfolia. Toward his old age, Ordov would send Yzak back to Evezeino with the Two-Laws Usurper Noah's help, realizing that he was still incapable of finding the Rainbow Road, though he never gave up trying. [/Spoiler]

[Spoiler] After waking up from a long sleep, he demands to meet Ordov, but Lebrahard objects, saying that he is in a far away world and it is difficult to contact him. Because of that Yzak declares war on Ottlulu and Pablohetara, as he threatens to invade the Holy Sword World Hayfolia. [/Spoiler]

[Spoiler] He fought against Anos on equal footing, and even killed him, but Anos revived himself and defeated Yzak with difficulty. [/Spoiler]

It should be noted that the relationship between Yazak and Ordov closely parallels the relationship shared between Hero Canon and Anos, as the two went from arch rivals to friends over the course of their battles.

[Spoiler] Yzak later attends Ordov's funeral in the Militia World, and has one last conversation with his old friend. After fist-bumping Yzak's knee, Ordov passes away peacefully knowing that their worlds stopped fighting, and begins reincarnating. [/Spoiler]