Firebird

Quetzal, in fire colors.

They can glow, create light.

The feathers are actually on fire once separated from the bird when touched by someone worthy. It's like holding a candle. It slowly burns up, and when you use the magic in other ways it burns up a little bit, and when its magic is gone, the feather is gone. But if you just keep it and not use it, it brings you luck and the feather remains untouched.

They can shapeshift into human form.

To someone not worthy, it doesn't burn or light up and brings them bad luck.

Have incredibly beautiful and enchanting song that can ensnare you, subtly manipulate you.