Shyra
Shyra (JP: シャイラ Shaira) is a deceased Lightner in Deltarune. She is implied to be Shyren's sister.
Shyra is never seen alive in game. Her tombstone is marked with a karaoke microphone.
Not much is known about Shyra's personality, but she is described as "a brave singer" on her gravestone, suggesting she was a couragerous and passionate individual who was unafraid to share her voice with others.
Shyra's gravestone is situated in Hometown's graveyard, placed to the right of the gravestone of Muttler. Kris can visit the gravestone at any point that they are allowed to explore Hometown.
In Chapter 3, when Susie recalls Toriel comforting her at the graveyard, Shyra's grave is the only one missing. This implies that her death was more recent than the others at the graveyard.
In Undertale, Lemon Bread is one of the Amalgamates encountered in the True Lab. One of Lemon Bread's components is revealed to be Shyren's sister, who had "fallen down" before the events of the game.
Shyra presumably corresponds with Shyren's unnamed sister in Undertale.