First let''s begin with Apocalypse relationship.
~what is his relationship with Yualina ?~
Apocalypse loves Yualina because of her caring and charming nature. He prefer to tease her a little instead of foaning over her, thinking it would insult her pride if he did so.
~what is his relationship with Eali ?~
This one is mre complex he see Eali as an almost sacred being, he would gladly sacrifice his life to save her (he would do so for all his wives but if someone told him to chose between is other wives or Eali then he would chose Eali). He however treat her as an equal despite being over-protective.
~what is his relationship with Eleonore ?~
I think it somethng like : two people who are more than sex friend but stil have trouble facing it.
~what is his relationship with Lara ?~
Lara was his first love and although too shy to admit it she also loved him back, in oder not to show it but still leaving some hint here and there she teased him a lot and practiced Karate so she could have something in her sleeves to deal with Apocalypse violent behaviour. He often act like he doesn''t want to see her but in reality he respect her greatly, sometimes even thinking she would fit being an apostle more than him.
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~what is his relationship with Glymina ?~
for now his relationship with Glymina is more than akward, at first he wanted to make a princess slime so he and his wife could have fun with it (not slave thing okay, just the usual sex play. She would have been treated like any normal human being) but seeing that she had already a grown personnality he wouldn''t have the fun to teach her all type of things. Making him regret his plan.
~the dragon goddess said he was an incubus king in his previous life, will it matter in the story or is it just some bullshit so you could build a harem ?~
There will be an entire arc dedicated to that, it will affect the story greatly.
~why are there the seven deadly sins even in another world ?~
The gods managing this world are buddies with the god managing Mundus. (No christan thingy, the god managing Mundus actually hated christianity as it fucked up most of his magical expantion plan)
~In what years did Apocalyse live (you know since there is VR and stuff)
Apocalypse became 14 years old on the 26 of March 2239.
~why don''t the nearby kingdoms or even the church knows about Apocalypse being a SSS rank adventurer and a Vermillion ?~
First Apocalypse did is best for the four first years not to have his name revealed publicly, he also killed most of the spies sent to watch over him.
~How come he doesn''t feel anything when killing someone ? It isn''t realistic.~
Apocalypse and the other Vermillion aren''t human and that what matters. The Vermillion were built for war against beast almost over ten school bus long and breathing freaking fire. They don''t fear death as they aren''t even alive, their instincts tell them that dying is just returning to the earth father. Though some still show human reaction when facing an Apostle who are even greater existence.
~Why are they even fighting ?~
I''ll explain later.
~how did they know their names were Vermillion ? I call bullshit.~
In a magic world names hold an even more powerful meaning then on Earth, they don''t forget it .... ever.
~why did the dragons not reacted to the Vermillion''s reappearance, they must have met after four years.~
The dragons are the Vermillions ennemy but they are not stupid enough to whipe the out like before, it''ll be exlaipned later.