During your adventure in The Legend of Zelda: Skyward Sword HD, you will encounter different NPCs that need Link’s help to solve their problems. These side quests aren’t generally too complicated to clear, so it’s always a good idea to complete them, as you will receive some nice rewards for your troubles.
Here’s how to complete the Missing Sister and what you get for completing it.
How to Complete the Missing Sister Side Quest in The Legend of Zelda: Skyward Sword HD
Before you can begin the Missing Sister side quest, you will first have to complete the Missing Child side quest. Once you do, head over to the Plaza to the south of Skyloft to find Parrow. Speaking with him, you will come to learn that his sister has gone missing.
To find Orielle, you need to head to the southwest, near Fun Fun Island. Here, you will find a small island with Orielle and a Loftwing. She managed to land safely on this small island, but she needs medicine to heal her Loftwing and make it back home.
After finding Orielle on the small island, head back to Parrow to obtain the Mushroom Spores that can heal the Loftwing. Return to Orielle and hand over the Mushroom Spores. In exchange, you will receive 5 Gratitude Crystals
After Orielle has flown away with her Loftwing, return to Parrow and speak with him to complete the side quest and receive 5 more Gratitude Crystals.