Lyra

Lyra the "Lyre" is a Celestial Spirit that has no obvious combat abilities who is owned by her summoner Lucy Heartfilia. She is also very well informed about magic for some odd reason.

Garuna Island arc
Lyra appears after Lucy summons her to lighten the mood. As soon as she is summoned she becomes estatic and politely complains about never being summoned. She goes on to sing a song that makes Natsu Dragneel and Happy happy, but her song causes Gray Fullbuster to cry making her stop singing.

As soon as she stopped, everyone went to the top of the ruins to see the moon ritual taking place. Here Lyra explains the power of "Moon Drip" and it's effects on the ice sealing Deloria. After the fight with Reitei Lyon begins, Lyra leaves.

Loke arc
Lyra makes a minor appearance as she does musical songs for the play Erza Scarlet forced team Natsu to do.