Sheila (Elementary, My Dear Sheila)

Sheila was a Sentient, one of the original species from the birth of the universe. She was made up of sentient helium atoms, enclosed in a balloon, and was a friend and companion of the masked Mexican wrestler, Señor 105, whom she met in Paris. (PROSE: Elementary, My Dear Sheila)

Biography
Sheila was rescued by Señor 105 in Paris. (PROSE: Elementary, My Dear Sheila)

Appearances
Sheila originally existed within the contents of a yellow latex balloon, however, she was popped by Diana Gulbronson and Señor 105 was forced to place her into a green balloon. (PROSE: Elementary, My Dear Sheila)

Behind the scenes
On Paul Hanley's account, he revealed that the balloon held by David Bowie on the back cover of Lady Stardust may contain Sheila.