Lyra

Lyra, "The Lyre", is a one of the Silver Keys' Celestial Spirit that has no obvious combat abilities and is owned by the celestial spirit Mage, Lucy Heartfilia.

Appearance
Lyra looks like a young girl. She has waist length hair that curls at the end, and wears a pink bonnet on top. Her cheeks have blush marks, and she wears a long dress with heart prints by her waist. She wears leather shoes as well. She has wings and a giant harp on her back.

Personality
She is a very happy spirit, especially when she is summoned. However Lucy states that she can only be summoned three days a month. She is also very intelligent in Magic such as when she explains what Moon Drip is.

Galuna Island arc
Lyra appears after Lucy summons her to lighten everyone's mood. As soon as she is summoned she becomes ecstatic 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 Deliora. After the fight with Reitei Lyon begins, Lyra leaves.

Loke arc
Lyra makes a minor appearance as she sings musical songs for the play Erza Scarlet forced Team Natsu to do. In the anime, Lyra also appears with all of the other spirits Lucy summoned to persuade the Celestial Spirit King to spare Loke's life.

Magic and Abilities
She has no combat abilities seeing as she's merely a performance Celestial Spirit. She is a very good singer and a harp player. Her songs themselves can also embody the heart and feelings of the people who are listening, as was the case with Gray.

Immortality: As a Celestial Spirit, Lyra cannot die, unless she is forced to stay in the Human World somehow.

Trivia

 * She apparently complains to Lucy about how she doesn't summon her often, though Lyra is reminded that Lucy is merely keeping their contract in mind.
 * Lyra can be summoned on Wednesday of the second week of the month, and the Thursday and Friday of the third week of the month.
 * During the Loke arc in which Lucy, Natsu, Erza, and Happy participated in a theater mission, Lyra was summoned due to her singing powers. However, by the end of the mission, it became clear that the group had to perform three times a day which would either simply that Lucy had altered Lyra's contract of "three appearances a month", or she was kept in the human world for a week's time.