Spirits

 are pig-like creatures that make their debut in Angry Birds: The Blues and the City of Spirits, and also appear in the sequel and its spinoff made by ComboLuigi2000, as well as Angry Birds: Out of Darkness. All of the spirits each represent a specific bird and a part of their body are on flames, with the exception being the Basic Spirits.

Gallery
(Credit to ComboLuigi2000 for making the art)

Story
In October 1991, There was a plaza located in Pig City, the city in which King Pig resides. In this plaza, there roamed seven citizens, Five of which, are visitors, those being, Gil the Bodybuilder, Sven the Motel Worker, Veronica the Masseuse, Rose the Synchronised Swimmer, and Riley the Candyholic. The other two, where residents, those being Rod and… Rod, coincidentally, they had the same name, but the oldest one went by the name of "Rod Burn", Rod Burn was a bit of a party animal, and often threw karaoke nights and discos, Rod usually either, came to these, or listened to the music from his small villa. However, a master criminal, living near this plaza, usually wearing a jacket, got annoyed from this partying, annoyed to the point of murder. Rod Burn died because of him, and became a maroon colored ghost in the afterlife, Jacket Pig also sabotaged the day-to-day activities of Rod, Gil, Sven, Veronica, Rose, and Riley, intending to kill them, for an unknown reason, presumably because they annoyed them too.

Afterwards, the seven spirits met up, and became friends, as they haunted the plaza they were killed in.

Thirty years later, another master criminal (who was the son of the Jacket Pig) hid ten piglets in the plaza, and three young detectives came to solve the mystery of their precise location, the spirits where annoyed by them, and wanted to scare their socks off.

After the mystery was solved, the spirits were annoyed by this and decided to move to an abandoned plaza in Transylvania, Romania, there, they met six more spirits, who were also killed by the Jacket Pig. They also tended to clone themselves, and named them the Junior Spirit Scouts.

Two years later, they returned to Pig City after becoming homesick, only to find out that their plaza is now a shopping mall. They then decided to haunt the mall, and eventually destroy it.

Afterwards, ANOTHER mystery was solved, annoyed, they flew off into the sunrise horizon.

Detective Blaser
The spirits haunt an abandoned mansion after flying off, later managing to catch The Blues and Silver, plus, Working with King Pig to steal the flock's eggs, eventually turning King Pig into a spirit, and then use the Blues' and Silver's spirits to empower him. But Blaser found out, and the rest of the spirits were informed after he defeated Riley. Blaser solves the mystery, bringing the Blues back, and leaving the other spirits annoyed.

Angry Birds: Out of Darkness
After the events of Angry Birds 3: The Final Flocktier, the spirits are able to sneak through Hope's portal and go to haunt a large mansion. There they haunt Holly and all others who come there.

Trivia

 * These ideas and design were originally made by ExcitedGreenPig6 (Cerdan).
 * However, the artwork above was made by ComboLuigi2000.
 * Blake, Kirk, and Jack are made by Ben4497098
 * Jack was also meant to be a spoof on "Jack Frost"


 * The Angry Birds: Out of Darkness Spirits were created by SweetSquidTea.