You're over thinking. I have absolute zero Hrungnir. Bring blue Sonia//Hrungnir, bubblie, Siegfried, Raphael. Echidna.
Any combination of; HP to survive dubs, full board shift, +orbs, and king slime will destroy the enemy. Seriously, you need like 2200 damage from the right guys total which you et often from your leaders alone.
Sounds fun? You know what's not fun?
Salamander.
Y'know?congratz to all good rolls! SiuS need longer nails to get those raphael abs xD.
She's good in any spot Valkyrie is. She just makes water inatead of light. I use Metatron lead (or Valk), siren, friend I&I, king shynee, and echidna. Or bring both Valkyries. Or use both water and dark Valkyrie with Haku for recovery options!
Really, she's just a solid water maker who happens to support existing color configurations.