Seras will do what she's meant to do. She'll grab her ridiculous oversized guns, and protect people. This means she'll very likely shoot down some sort of very large transport or plane of the HIVE's from a long ways off at some point. It's a classic kind of moment for her, and I won't be able to resist it.

Other than that I see her providing a lot of heavy support to her follow officers. Wish I could be more inventive, but I'm pretty tired right now.