WARNING: Spoilers for the ending of Skyward Sword below! Read at your own risk!

7. Permanent Sleep

Fi's promise to see Link again in the future wasn't a total lie. Of course, it wouldn't be the Link of Skyloft, but she was sure he understood that. Even Demise had promised that they would meet again in the same fashion (except for poor Ghirahim, who was probably gone for good now). Fi knew this would be true; it was what she had been created for. She was merely a vessel to assist the Goddess's Chosen Hero gather flames and guide him through Silent Realms.

She was a being of ultimate intelligence, able to analyze an enemy quickly and warn Link of their strengths. She knew practically everything about every flower and insect on the Surface and in the Sky. It was her function, her purpose… So why was she unhappy about it now? No… not unhappy. That was the wrong word for it, and she knew it. Seeing Link's shocked and mournful face had struck a chord that Fi never even knew existed.

From what little she understood of human emotions – that was Ghirahim's job, not hers – she was feeling something akin to 'sadness'. And 'exhaustion', as she remembered Link collapsing into bed despite her whispers to keep on moving. Her friends, yes… she could call them that, were leaving her all alone for only-the-Goddess-knew-how-long.

And chances were, she would never wake up again. Sure, she would help the various Links through time and location, but she would never be conscious again. If Link knew that, though, he'd probably try to prevent her from what humans called 'dying'. While it was perhaps similar, she related it more to a type of thing that Surface animals did during the winter – hibernation.

Yes, she would be forever asleep, but she grew happy about it. At the very least, she'd be helping her master and his descendants as the Master Sword. It would be better than anything else she could have done, probably.

With a satisfied sigh, she released herself, becoming one with the sword that she would sleep within forever.