Hyrule Warriors Legends: How to Unlock All Playable Characters

Ruto

To unlock Ruto, you must work your way through the main Adventure Mode map to square 5-10. That’s the fifth row down, tenth column in from the left. Before entering the challenge, you must use a Power Bracelet item card to move the large rock on the map. It’s on the left side, and is the only green block that’s not a bush. If you want to be sure you’ve got the right spot, use a Compass item card first. Moving the rock makes Ruto a new reward for completing that stage.

From there simply complete stage 5-10, and Ruto will then be unlocked. Her starting weapon is the Silver Scale.