Professor Anne Finnelan teaches Magic Linguistics, History of Magic, and Object Control Magic at Luna Nova Magical Academy, also managing student counseling and academic affairs. She presents with brown hair in a bun featuring two front fringes, blue eyes, and a pale complexion, consistently wearing Luna Nova's standard teacher uniform complete with a two-feathered hat.

Finnelan embodies strictness and formality, fiercely committed to preserving Luna Nova's traditions and prestige. She demands unwavering discipline and respect, openly favoring magically gifted students like Diana Cavendish while showing disdain for underperformers or rule-breakers such as Akko Kagari and her friends. This devotion to tradition translates into rigidity, especially during crises, where established protocol overrides unconventional solutions. Her fastidious nature breeds intolerance for plots, tricks, or emotional attachments she views as disruptive.

Her magical proficiency includes advanced spells like Luna Lana, protective barrier creation, and expertise in object control magic, complemented by deep knowledge of ancient magical languages like the Luna Alphabet.

Within *The Enchanted Parade*, Finnelan disciplines Akko, Lotte, and Sucy after their potion experiment accidentally creates a Matango-like monster. She assigns them mandatory participation in the academy's Witch Parade alongside known troublemakers Amanda O'Neill, Constanze Braunschbank-Albrechtsberger, and Jasminka Antonenko, threatening expulsion for failure, demonstrating her zero-tolerance stance. She remains deeply skeptical of Akko's non-traditional "Happy Time Project" to transform the parade into a magic celebration.

Character development across media shows evolution. The Keisuke Satō manga depicts her overcoming bias following the "Orange Submariner" incident, thoroughly investigating a stolen answer sheet instead of immediately punishing Amanda and Akko. Later, witnessing Akko's first successful broom flight in "Tree of Leaves," she smiles, signaling growing acknowledgment of Akko's perseverance. In the light novel *The Nonsensical Witch and the Country of Fairies*, she supervises a field trip to Doras Hill, maintaining academic order, lecturing on the site's history, and displaying characteristic impatience with disruptions.

Her suspicion of Croix's magitech innovations later proves warranted when Croix's ulterior motives endanger the academy, reinforcing her cautious stance on blending technology with traditional magic.