eHP? Effective HP? How's that different?

Also, I was mostly thinking Momiji compared to Elva - I'm not sure about Awakening Garrett since I know from experience from CC-ing soldiers and such, that more blocks can sometimes mean more enemies than a unit can handle. I think Momiji's up to the task, though - one advantage of Strength of the Fierce God is that if she's getting overwhelmed I can let the paralysis take effect.