Yes, Pekola, as opposed to a certain dumb rabbit. The eternally-starving once-most-powerful angel. She actually won't attack at all until you meet her conditions of getting enough buffs. Thankfully, stuff like Python's FP buff stacks count as individual buffs. More hilariously, the fairy talent Fervor also counts as three buffs. This makes satisfying the conditions for her skill actually pretty easy.

What you get for doing so is a ridiculous RF that completely ignores enemy armor and shields. A major downside to this though is she wont deal as much damage as another RF if you don't need such capabilities, since she isn't affected by very many damage buffs due to how she works.

This should be obvious, but you should pick up her unique gear if you plan on using her.

Aka 64 Shiki if you're a weeb.

She's a bit of a complicated unit in that certain enemy thresholds alter what her skill does, thus making her work better vs bosses (with her colossal 90% FP boost for a few seconds) than for regular encounters. However, the timings are awkwardly short for the big boost, and the 2nd half reduces her firepower a bunch but also buffs the hell out of the stuff in front (which, if it's SR3, means more damage for her.) Note that the skill is less awkward than it seems, as it counts doll groups, rather than individuals, so 5x 5-linked enemies is totally fine, and so on.

Unfortunately, they removed cool tile buff tricks so her potential of giving insane buffs is a lot more limited than before