The Metroid series has heavily influenced gaming as a whole, but it often goes overlooked in comparison to other Nintendo franchises.
I greatly admire the Metroid Prime Trilogy. However, I don’t think Metroid is a big enough seller to be considered part of the “Nintendo Trinity”. Mario, Pokémon and Zelda sell way more and are more consistently released than Metroid.
Nintendo’s Trinity is undoubtedly Mario, Pikachu & Link in that order
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