Kyrie is a hero in My Little Pony 'n Friends. He is a magical canary with an enthralling song, whom Somnambula forces to lure victims for her to drain.
Kyrie's singing is hypnotic, causing all adult ponies who hear it to go into a daze and head towards its source. Somnambula uses it to lure victims to herself.
Eventually, Kyrie is finally pushed past the line, escapes and helps the ponies defeat Somnambula.