Esri Tuatha Dé

Esri Tuatha Dé is Lugh Tuatha Dé's mother in the anime The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat (2021). She is the wife of Cian Tuatha Dé (the head of their noble assassin family) and comes from the Viekone noble house, making her a relative (unspecified in the anime) of Dia Viekone.

In the anime, Esri appears as a cheerful, youthful-looking woman (despite being in her 40s) with long light purple hair and blue eyes. She is portrayed as extremely doting and affectionate toward her son Lugh, often to an over-the-top, embarrassing degree (with heavy "son-con" tendencies), while having a somewhat airheaded or scatterbrained personality. Despite her silly and happy-go-lucky demeanor, she shows subtle cleverness and awareness at times, and it's implied she has some training in the family's assassination/self-defense techniques due to her strong mana bloodline.

Her role is mainly supportive as a loving (if overly clingy) parent in the early episodes, providing comic relief through her interactions with Lugh.