[Agema]

Some characters do seem to have a battlefield autosummon, sort of like carrying a bag of winds and getting an air elemental. There's a titan god chassis that every time it enters battles get about half a dozen free shades/shadows/whatevers that last only for that battle, not sure whether that's in CBM or vanilla, though.

A hero that does something similar could be useful. It means they can't build up chaff, but they get a decent advantage on the battlefield.