I've seen some Yveltal characters like  darkzeus, and now I made my own.
Name: Gallo Oblio
Species: Yveltal
Gender: Male
Age: 521
DOB: March 25, 1494
Hometown: Florence, Italy
Weight: unknown
Height: unknown
Bio: Gallo Oblio was born human. He became an Yveltal at age 27. His attacks are Oblivion Wing, Dark Pulse, Phantom Force, and Gust. He could do so many things as a Pokémon of Destruction. He can only be human again for a short amount of time. Fortunately, he can sizeshift when not human. The one thing he hates being called is "bacon bird".
Fun Fact: he's the first Italian I made.
Gallo: Hmm ... Cosa fare con tutti voi micro? (Translation: Hmm... What to do with all of you micros?)