Cai has Aubin's crest
Leda has Timotheos crest (able to summon beasts like Hapi was)
Cat girl has Noa's crest
There will 100% be a character with Chevalier's crest in the game
The Heroic Games is actually just a scheme to reunite the crests of the 4 Apostles and try the Ritual of Rebirth one last time.

>>721121405
>so it's likely that he is the child of a nabatean and a human or something similar
He's one of the four Apostles. He has washed out hair and Nabataen features because of the experimental ritual Rhea did to him. He's biologically immortal like Aubin was and has been ruling Dagda as the Sovereign for centuries after getting exiled. If I had to guess his name, probably Chevalier