Spring Sharena or Gunnthra?

Either works really, I feel like Sharena hits harder. However, Gunnthra will be useful to have because she's a legendary hero meaning you can actually utilize blessings. I would probably pull for Sharena because she is a limited unit.

Gunnthra is a pretty lack luster unit without horse buffs. Also, you already have two sources of magic damage.

If you are looking for a green slot, P/NY Azura is a good option. Hector/Amelia/Brave Ike is also a good pick. If you really want a green mage, I would go with Nino. She is arguable better and more easily available.

spring sharena is cuter imo