Light spirit

The light spirit is a small yellow spirit with two leaves resembling ears on its head. He was one of the many spirits that migrated to the physical world after the Harmonic Convergence of 171 AG.

History
Two weeks after the Harmonic Convergence of 171 AG, the light spirit had migrated to Republic City. He followed Jinora, along with several other spirits, as the young airbender was accompanying Avatar Korra and Tenzin into the Spirit Wilds. He briefly disappeared after being startled when the Avatar firebent a large portion of spirit vines, but returned soon after and stayed by Jinora's side.

The light spirit migrated further to the Misty Palms Oasis sometime before Team Avatar arrived searching for Aiwei. He played with Pabu outside the Misty Palms Inn when Team Avatar went to check in, and later sat in the iceberg at the center of the oasis, alongside many other spirits, when Mako and Bolin returned looking for Korra.

In 173 AG, the light spirit found Avatar Korra meditating in the Tree of Time, and cheerfully announced her presence to the rest of the spirits in the area. He asked Korra why she had been gone for so long and listened as Korra explained her troubles to the spirits. The light spirit offered to help the Avatar recover, but she declined, stating she needed to figure it out on her own.

Six months later, the spirit manifested itself as a small white puppy and met Korra again in an Earth Kingdom town. After the Avatar squatted down to pet it, she was haunted by an apparition of herself in the Avatar State. The dog turned and growled at it, apparently causing the apparition to disappear, and leaving Korra wondering how he had done that. He barked towards Korra and convinced her to follow him, and eventually led her to the Foggy Swamp, where he revealed himself to her. While she was annoyed with the fact that he deceived her, he pointed out that she wouldn't have followed him otherwise. Korra asked what she was meant to find in the swamp, to which the spirit vaguely replied that it wasn't a "what", but rather a "who", before flying off into the thicket.