Doremi Harukaze habitually claims the title "the world's unluckiest pretty girl," citing perpetual misfortunes in her life as an average elementary schoolgirl. These include academic troubles, family friction, and missed chances to enjoy her beloved steak. Her appearance features fair skin, bright magenta eyes, and long red hair often styled in twin buns secured with pink scrunchies, one adorned with a yellow music note. Her casual wardrobe evolves from a pink T-shirt layered over a purple tank top and light pink shorts to include vests, belts, and knee-length socks.

Her personality blends overt childishness and impulsiveness with profound kindness and tenacity. She shows jealousy when others surpass her, especially in magic, yet consistently steps in to help despite personal friction, frequently forging friendships through persistent, well-intentioned efforts. Early traits like gluttony, distractibility during spells, and crafting self-serving incantations fade as she matures. A core aspect of her development involves conquering deep insecurity born from perceived inadequacies compared to peers and family, notably her younger sister Pop, whom she initially resented for appearing more responsible.

Her magical journey starts when she accidentally exposes witch shop owner Majo Rika, triggering a curse that turns Rika into a frog. To reverse this, Doremi becomes a witch apprentice. She is later joined by friends Hazuki Fujiwara, Aiko Senoo, her sister Pop, and eventually rivals-turned-allies Onpu Segawa and Momoko Asuka. As the first apprentice, she informally leads the group, using a pink bean-shaped crystal ball alongside her fairy partner, Dodo. Her spells include transformation chants like "Pretty Witch Doremicchi!" and incantations such as "Pirika Pirilala Poporina Peperuto!". Magical mishaps, often caused by hunger or emotional distraction, are common early on.

Critical responsibilities shape her growth, most significantly raising the future Witch Queen candidate, Hana, after witnessing her birth in the Witch World. This role intensifies her protective instincts, with Hana viewing Doremi as her "true mother." Subsequent seasons involve passing patissier exams while managing a magical bakery in *Mōtto!* and navigating Hana's accelerated aging and loss of magic in *Dokkān!*, where the group crafts handmade gifts to break a curse threatening both human and witch realms. Her magical uniforms evolve across seasons, reflecting thematic shifts from floral designs in *Sharp* to pastry chef attire in *Mōtto!* and button-adorned outfits in *Dokkān!*, each featuring distinct transformation sequences.

Key relationships define her journey. Her childhood bond with Hazuki offers mutual support, while her initial dislike for Aiko evolves into admiration for her honesty. She displays maternal devotion to Hana and reconciles long-standing jealousy toward Pop, embracing her role as protective older sister. Romantic interests include an early crush on wizard Akatsuki and eventual feelings for classmate Tetsuya Kotake, transforming their antagonistic dynamic into mutual respect. She also aids characters like isolated classmate Kayoko Nagato and spoiled peer Reika Tamaki, bridging social gaps through empathy.

Background elements include a traumatic childhood piano recital failure that instilled lasting insecurity, though music remains significant through her naming theme ("Do-Re-Mi" from solfège notes). Her parents noted similarities between her younger self and Pop's spirited behavior. The series concludes with her relinquishing magic to preserve human connections, choosing a normal life at elementary graduation despite the offer of extended witch longevity. This decision resolves her core conflict between ambition and community, affirming her growth from self-described misfortune to finding strength in ordinary relationships.