Put simply: do not make your agents Suvians.

The world of the PPC is one where agents - moderately regular folk, just out to get their job done, wipe out evil, and hopefully avoid going flamethrower-crazy - struggle through badfics, and ultimately perform The Duty with some difficulty. They're at a disadvantage - basically everyone they have to face down is in some way more powerful than them, whether it be a canon character they have to keep from getting killed by while their partner sets up an exorcism, or a Suvian they have to fight or even just catch.

If your agent has an easy time of their missions, you're doing it wrong. If you find yourself giving them powers or weapons because you 'need' them to take down the misplaced flora and fauna you're planning to send them against, you're doing it wrong. If, in fact, you're planning on giving them a power without consequences, a bonus without a downside, a plus without a minus - you're probably doing it wrong.

hS