Card Lores:April Fools' Ghost

She's quite mysterious. Her name appears on the resident lists of the mansion. But, no one has actually met her in person. She stays in her own room, alone, throughout the year, doesn't even join a single meal nor meeting. And once every year, she will show up in the living room, and plays tricks to amuse people and greets everyone as she introduces herself again since not many people will recognize her and this place gains new visitors regularly. She's not a bad person, she's kind of fun, but she's mysterious.