>>715211917
Link tends to be a darker blonde than Zelda, holds true even for BOTW/TOTK. Last Zelda game where Zelda and Link had super similar or even identical hair would be Ocarina of Time that had a vague implication they WERE related and is the only game to come out and say so

Hyrule Warriors gives them the same hair tone again but I think it's the Ocarina of Time influence on their designs; Link himself isn't nobility or stated to be of any kind of relation to Zelda, he's a grunt footsoldier and in training anyways before the game's first battle where he steals a knight's sword and shield to go fight