Hemotropic Butterfly (
Appearance
Hemotropic Butterflies have a red body and bright red wings. The tips of their wings are a darker shade of red.
Behavior
Hemotropic Butterflies can detect the scent of blood from a good distance. The more blood there is, the more butterflies gather around the victim. However, like ordinary butterflies, they can also feed on nectars.[1]
Plot
Hunter Exam arc
Attracted to the scent of Gon's blood, a few Hemotropic butterflies feed off the open sores on Gon's hands. This inspires Gon to use one to locate the wounded Hisoka.[1]