Smash Ultimate · High Tier
Two characters in one slot is what puts them in S tier, so each form receives two nerfs. Pyra's kill combos run through down air and down tilt into her many kill moves; Mythra has enough combo tools and kill power that a player could ignore Pyra entirely.
Nerf around three moves per character that are too oppressive inside an already strong kit. Not every suggestion needs to be implemented.
Each entry lists the move or ability affected, the adjustment itself, and — where the analysis states one — the problem it is meant to solve and the reasoning behind it.
Pyra & Mythra is one of Smash Ultimate's entries — the full tier-by-tier breakdown covers the whole roster.