Valeria Luna, also called Inaho Misora in Japanese or Hailey Anne Thomas in English adaptations, is an energetic 11-year-old living in Floridablanca. She studies in Springdale Elementary’s class 5-1, separate from classmate Nathan Adams who views her as clumsy. Her family comprises an unnamed mother, a father employed in the United States, and a younger brother, Ricky, who often spies on her.
Physically, Valeria has light skin, short purple bobbed hair with a full fringe, and blue-gray eyes accentuated by round glasses. Her signature outfit includes a blue top revealing a partial yellow music note, layered under a pink cardigan featuring white-and-pink striped cuffs, paired with a white denim skirt, dark blue leggings, and yellow sneakers with white laces and soles. Alternate attire encompasses winter wear—a blue jumper under a white jacket with pink details, light brown skirt, pink tights, and brown shoes—and various film costumes like a Santa dress or an explorers outfit with beige helmet, shorts, and pink knee socks. On the Cluvian Continent, she wears specialized exploration gear.
Personality-wise, Valeria is talkative and obsessed with space, aliens, and anime—particularly "Sailor Nenas" (localized as "Sailor Cuties"). She habitually collects merchandise and draws real-life parallels to anime plots, overlooking practical dangers and frustrating her Yo-kai partner, Usapyon. Though occasionally airheaded with a short attention span, she spots informational inconsistencies. When disheartened, she self-soothes by jumping repeatedly, rarely showing sadness.
She acquired the Yo-kai Watch Model U prototype from an anime store after a figurine sold out, later upgrading to Model U2. Partnered with Usapyon, she co-founded the "Ha-pyon Detective Agency" (name customizable in-game) to investigate mysteries. Their dynamic thrives on her exuberance versus his sternness, yet they share a strong bond. Valeria idolizes Nathan Adams for befriending Yo-kai.
In "Yo-kai Watch 3," Valeria is a playable protagonist who meets Usapyon in an alley, sparking joint detective quests. Key events include befriending Nate, Whisper, and Jibanyan during a factory investigation in Chapter 6; collaborating with Buck to solve a mansion mystery in Chapter 7; and encountering Enma Daioh—mistaking his robe for cosplay. In "Yo-kai Watch 4," she appears in Chapter 5 to identify disruptions from future Yo-kai, later kidnapped by Fukurou (who believes her a princess). Post-rescue, she recruits Usapyon and features in "Blasters++" as a playable character attacking via Yo-kai Drones. She minimally appears in spin-offs like "Wibble Wobble," "Medal Wars," and "Dance: Just Dance Special Version."
Across media, her anime role reduced to avoid otaku stereotypes, though she remains an Easter egg. Early Spanish manga translations renamed her "Celeste Duque."
Her relationships include a close friendship with classmate Jessica, who tolerates her enthusiasms despite differing interests. She shares a complex dynamic with Isabel, who confessed affection while inspirited—a moment Valeria reciprocated positively. She bonds with Jibanyan over fandom of the band "Pussycat Miau." Interactions with Clara are friendly but limited by their companions.