Lumina

The ghost of a firefly blessed by the protection of a river god. Her soul is tied to the lamp she's always carrying around.

She used to be a regular firefly, living near a river. As per tradition, a nearby village would always light up a line of lamps along the river banks, to guide the river god on his yearly descent through the current. One year, however, a powerful storm kept the villagers in their houses, barring them from setting up the lights. Among the rain and wind, Lumina flied along the river, attempting to guide the god with her feeble light. However, she soon ran out of strength, falling at the feet of the line of lamps. The god stopped his journey, and as an act of gratitude, tied the poor firefly's soul to a nearby lamp, whose light would then shine forever; both Lumina's and the lamp's.

The flower she always wears in her hair is also a gift from the river god.