User blog comment:Helios43/If someone is willing to help me build a squad I appreciate it/@comment-26944381-20160524231628

Selena and Vargas first for sure, from then:

Charla/Elza; Laberd; Isterio; Quaid (if you don't have any other elemental buffer, like Shida, Allanon or any unit from Griff's batch); Chrome; Klaus; Old Grah.

Those are all the units that I recommend you to evolve first.