As strange as it is, Link is an even more indispensable character to the Legend of Zelda series than Princess Zelda herself. As the player character, Link always takes the central role in the gameplay, while Princess Zelda is relegated to being a side character, or is even absent entirely in some games in the series.
Source：https://www.cbr.com/totk-should-have-made-princess-zelda-playable-character/
