Hi anon! For the purposes of Meadowlark, we're defining powers as any ability which is extraordinary to human. That said, we won't be nerfing reasonable passive abilities that have a physiological origin, like, say, a human who is stronger or faster than the average through training. The same goes for non-human characters, so if a non-human species has gills, or has more muscle mass, or has tougher skin, they'll keep those and the strength and resilience that come with them!

Characters keeping weaknesses is something we're leaving to player choice. If a player would like their depowered vampire to still burn in the sun, or for a depowered Clark Kent to still feel the effects of kryptonite, they can do so! Or, if they'd prefer them to be effectively entirely human, they can do that instead.