User blog comment:Linathan/Squad Spotlight & Guide: Trial 008/@comment-26053138-20151202210949/@comment-26347196-20151203050659

I would say though, that a 7* Paris may be the one true defender for Galaxy, as she has 15% to reduces damage into 1, and she can replace Bestie as a sub.

Another unit who can fit into this may be Quartz? Even though he has 50% to proc Angel Idol on ES, he still has a chance to survive Galaxy.