Ruru

Ruru is a petite fairy-type phantom, barely ten centimeters in height, who travels alongside protagonist Haruhiko Ichijo at all times. Despite bearing an impossibly long full name and technically being a phantom, she harbors no ill will toward humans whatsoever. Known for her free-spirited nature and tendency to meddle in others' affairs, she can usually be found perched on Haruhiko's shoulder or head, gleefully teasing and roasting the rest of the group from her ringside seat. She serves as the series' primary comic relief and the spark that keeps the team's energy alive.