A whitish-pinkish cat. You had to rescue one real early in the game. During the day, Remlits are normal cat-like creatures, but at night they turn into aggressive monsters that will attack you.
How to Defeat
You can’t actually kill a Remlit. Instead, you can hit it twice with your sword to stop it from attacking you. If you throw a Remlit after making it passive it will attack again, and the same will happen if they fall off the edge of Skyloft and fly back.
After giving all the Gratitude Crystals to Batreaux, Remlit will no longer become aggressive at night. So that counts as “defeating” them, maybe?