Spirits that need a steady supply of mana... that sounds like our GFs. We have sort of a symbiotic relationship with them. They give us powers and access to magic, but we sort of give them a part of ourselves for them to feed and thrive on, when they aren't being summoned in our defense.

So I guess that means that potential SeeDs inherently sort of work in a similar department to you. We're assigned initial spirits to let us learn how to use magic, and as we get better we get paired with one that works well with our inherent nature. Mine is called Siren.

[But now he was wondering if some of those things Waver and them interacted with might sometimes be GFs like Garden Cadets desperately needed.]