User blog comment:Crimson Storm Mich/Future Units Preview v2/@comment-27362456-20160917200240

Checked out Quaid and Zellha's lore on the reddit. Long stories short:

Quaid:

Quaid works to stop conflict between the Gods and humankind. He is given the Thunder Sabre Kaminari from Diana after they exchanged vows. Everyone else in the squad is dead and waiting for him in the afterlife.

"I shall not lose to any difficulties! For there are people who have etrusted me with everything, and are waiting for me!" (Hence him having not only having Diana's Sabre,  but Claire's skirt bit, Colt's cape, Fahdal's circlet and Ivris' necklace).

Zellha:

If Kajah hadn't stopped Zellha from going to Bariura, she would have killed Shida and taken his powers and would have caused even greater chaos in the war between the Gods and Humans.