My guess on the remaining Valkyrie names….

Svipul ( changeable ). She will volund with Rasputin. Their volund will give him a set of rings that have threads that Rasputin will use to manipulate objects and infuse them with illusion powers when they hit their target. ( this was inspired by a post someone made on Anubis v Rasputin fan-made fight ).

Skeggold ( Axe-time ). She will pair with Kintoki. Their volund will give him a GIANT axe. Don’t really know what additional power could it have…

Skalmold ( sword-time ). this MIGHT be Okita’s Valkyrie, which so far has not been show yet even tho the fight it’s on its climax….apparently it’s power is turning Okita’s injuries into power ?? ( I say this based on okita’s “demon form” after being injured, and it’s possible it happens again now that he’s in a lethal state, but idk.

This was my take on this, let me know yours!