Yveltal

Yveltal is a legendary Elemental from Viur.

Appearance
Yveltal is a very short girl with blue eyes, black face markings and red and black hair. She's usually seen with a happy expression.

Personality
Yveltal is a curious case. She is always walking around with a happy and joyful expression, even though all the ever sees is the terrible fates that lead to people's growth of dark crystals. She will often blurt out what she sees in those crystals, often to the dismay of everyone around her.

Story
Yveltal was born as the first daughter of a well-known business family in Viur. They were in close contact and a business relationship with the former King of Viur, King Gropius. To ensure their children a bright future, they had them learn magic and rulership under the Kings children, Reshiram and Zekrom, as well as King Gropius' closest ally Celebi.

After the death of King Gropius, Reshiram began to take over Viur and eventually share his plans with his friend. However, Xerneas disagreed with Reshirams ideals and goals and distanced himself from him, taking Yveltal with him.

The two fled, trying to return to their parents, but they have already been murdered as a request from Reshiram. They found shelter in an abandoned school, where Xerneas began to heal those who were wounded fighting in the Great War. Yveltal had to hide while Xerneas healed his patience, in order to not disturb them with her blurt outs of their trauma.

After the Great War ended Xerneas and Yveltal moved back to Viur. Yveltal lived in a flat with Xerneas, and after Xerneas' new found fame, they moved into a castle, where they live up until today.

Cameos
In Phoenie's New Hope, Yveltal is a side character, who disturbs the two main characters by blurting out their trauma to each other.

In Night of the Living Dead, Yveltal blurts out the trauma of Nyx and Hieronymus, to which Nyx slaps her in the face. This is the first time she showed any emotion other than joyfulness.

Xerneas
Xerneas is her big brother who she loves dearly. He has always been very patient and protective of her. He's the only one who's never seen her as a nuisance.

Alan
The two met on an event and had a short affair. They stayed in contact and Xerneas thinks about him a lot.

Trivia

 * Xerneas is the only person who's dark crystals Yveltal can't read.
 * Since she can't properly pronounce Xerneas' name, she will always give him nicknames like Zwiebel-chan.
 * Despite being a grown adult, she is tiny and acts like a child.