If you want to make your Thunder team suck less, Sol would be a good pick. You could also use her in your Fire team if you wanted to run a Versatile build.

Uriel's a good pick also, but with Ares and Raguel you have a strong lineup already. And Uriel won't shine until her Awakening, so you can put her off til the 2nd or 3rd Miracle ticket if you want.