Okay, so, I get that a lot of design choices in RWBY are for Rule of Cool rather than practicality — it’s why Coco fights in stilettos — and unlike in most series it actually makes a little sense! Because RWBY baked into Remnant’s history an excellent reason why the characters would dress for aesthetic over practicality: self-expression is a key cultural value.
But even if the Doylist explanation for why Pyrrha wears greaves — and no other significant armor — despite how well it meshes with her semblance is…probably just that it looked cool…
…there is a Watsonian explanation, beyond self-expression. Since Pyrrha’s already got a bracer and her weapons on her arms, she’s got metal she can use to move her own limbs at higher speeds or with more mobility. Add in the greaves, and she can use Polarity to reorient her legs when she’s off the ground too.
Pyrrha set herself up to levitate and never got to show it off.


















