Fern

Fern is the oldest and most powerful demon king of all.

History
Fern was born with a mass amount of potential, enough to threaten the positions of the gods. His very existence could tip the gods off of their pedestals. As a child, he was cursed by Star, to have an unlucky fate always. His fate was exactly that. As a child, his mother died and his father had vanished. However Fern was not angry or depressed about this. His heart was kind and strong, so he continued with life. He lived in his mother's lily fields, looked after by his abusive uncle. He spent his time farming behind the lily fields and working for his uncle.

When he grew up and went out to sell his uncle's produce, he met a girl named Lily. The meeting was no mistake, as this was the person his uncle had arranged for Fern to marry. Fern was delighted and instantly fell in love with Lily.

Lily and Fern happily married and had a daughter called Ruby. One day, their rival family, who was angry at Fern's uncle attacked their home. They killed Lily and Fern told Ruby to run far away. As he was dying, he accepted what had happened. He lay as one of the rival's soldiers beat him, asking him why he didn't retaliate. Fern stated that he had nothing against the soldier and died as a human.

He became a demon king as the result of the curse. His heart became soiled with hatred and misery and he yearned to see his wife and daughter again. Hundreds of years of contracts and more curses passed, Fern grew tired of the repetitive cycle.

He discovered these items named 'soul gems'. He realised that his wife's soul was trapped in one of these, meaning she could be brought back to life. He also realised that King Takoshi was in possesion of his wife's gem. And despite his fondness of Tako, he killed him to get the gem.