Aries

Aries the "Ram" is a Celestial Spirit that is one of the 12 Golden Zodiac Keys. Her key is currently owned by Angel and it used to be owned by Karen Lilica.

Backround
Aries is a timid female that Karen, a celestial spirit mage, used Aries to do many horrible things for her such as used her as a shield (because apparently she has no fighting abilities) and used her to lead away all of her boyfriends. It is revealed that Angel murdered Karen and took Aries' key, although Angel doesn't seem to treat her any better, seen when Angel shoots through Aries to hit Loke.

Oracion Seis arc
Aries is summoned to battle with Loke and Lucy Heartfilia. Despite the two not wanting to fight each other, they knew they had no choice and sadly Aries battled her friend. However, Angel used Caelum to blast through her and hit Loke causing them to return to the Celestial World for healing.

Magic & Abilities
Aries's abilities are currently unknown but she apparently uses some sort of cloud like magic in combat.