By my interpretation:
The original destructive dragon (Aji Dahaaka) is the
absolute Chaotic Evil → Lunafs then put the purest soul ever known into Aji Dahaaka to control it → Demon King now splits those souls into two pieces( now here comes my interpretation):
Doux ¦→ The
purest Soul in the manga, literally a different race to any of the main cast.
Dahaka (after the split ) →
Chaotically good to Chaotically neutral (as evidenced by her "change of heart" and the powerset she has. Doesn't go out of her way to hurt someone (unless Doux is hurt, then Aji Dahaaka should come out)