The more power armour the better, as a combat engineer that make her all the more useful in situations where one is needed on a mission. Her power fists would count pretty well for close combat weapons, does she have any ranged weapons to go along with them? Otherwise there shall be a selection of weapons as well as the standard GIA plasma rifles. Hopefully she gets along with her CO then!

As to Shoutarou, he could work well in both cases. His motorcycle would work well for him being a mobile scout as well as being able to harass larger targets when needed with the weapon attachments.

Lina would be a rather useful battlefield caster indeed, magic artillery would be rather helpful. Though would she likely follow orders?