Hikaru stands among the series' main characters, radiating an energetic and outspoken personality that drives conversations. She openly expresses frustration toward the antagonist pursuing engine fragments. Beneath her lively exterior lies a reserved emotional core; she rarely displays vulnerability, startling friends when tears surface unexpectedly.

Her family foundation profoundly shapes her identity. Renowned composers dedicated to transmitting music into space, her parents frequently leave her alone due to professional demands. Their communication relies on a household whiteboard, symbolizing emotional distance. A pivotal shift occurs when Hikaru writes "moon" instead of "club" on the board, inspiring her parents to dedicate an observatory concert solely to her. This gesture unveils their hidden care, with them admitting they feel "spoiled" by her talent and disciplined nature. Hikaru further demonstrates musical insight by correcting her father’s manuscript with a "G" (sol) notation.

Magically, she wields acrobatic prowess with her drive shaft, prioritizing agility over speed during aerial fragment retrievals. Her growth includes embracing vulnerability and collaboration, highlighted in a joint "moon dream" endeavor with Subaru—a stark contrast to her earlier solo tendencies.

Hikaru’s journey centers on reconciling public assertiveness with private solitude, gradually opening emotionally through bonds with friends and family.