i live this its really good,
its the 4 elements fire, wind, water and earth,
the one with wings is wind i think, the one with her hair up is fire i think,
the one with the sword is earth i think,
and the last one with the spear is water i think,
im a right????
Their names... You notice all of their names are from mythologies, i took my start point from there. Then i added centuries; places they explored(for example, nyks started from egypt, went to anatolia then moved to eastern countries like china), their personalities and finally did a modern "today" touch
Actually these four young ladies were the goddesses in past who formed those mtyhological events and stories. So, it's quite confusing but logical in a way