Haruka's neglected stuffed animal that comes to life on the island. He helps defeat a large enemy by removing its threads, rallies the underground bandits to raid the airship, and attacks the Baron during the final confrontation.
Cotton represents Haruka's past, carrying emotional weight from her childhood neglect.
Cotton directly confronts the Baron, resulting in a violent and tragic physical clash.
Cotton's ground assault synchronizes with Teo's aerial attack to overwhelm the Baron's defenses.