Throughout the Zelda series, Link has often had a companion character that follows him on his journey and helps him through exposition, hints, and even additions to the gameplay. By being the one character that's always alongside Link, they're also the character that gets the most time to shine (apart from Link himself obviously).
The question is, which one is your favourite?
Note: If I have missed one, please let me know so I can add them to the poll ASAP