Fennel is a male elf who appears in the anime The Family Circumstances of the Irregular Witch. At 183 years old, he is quite young by the standards of his long-lived race, and this youthfulness is especially apparent when compared to the witch Alyssa, to whom he is a frequent visitor. He possesses the handsome facial features typical of elves, with blonde hair and orange eyes. His everyday attire often includes a bandana, which has become one of his recognizable visual traits.

In terms of personality, Fennel presents a contradictory front. He often speaks in a rough, easygoing manner, attempting to project a cool and collected image. However, beneath this exterior lies a deeply shy and timid nature. This contrast is most pronounced in his interactions with Alyssa, where his bold persona instantly crumbles. He is easily flustered and becomes disheartened when others, especially Alyssa, treat him like a little brother. When it comes to expressing his true feelings, he lacks assertiveness, frequently backing down at the last possible moment, a trait he has maintained for an exceptionally long time.

Fennel's background is rooted in his elven village. Having lost his parents when he was young, he was raised by his older brother, Anis, and the other villagers, ensuring he never felt truly alone despite that early loss. He works as a merchant, a profession that has earned him the trust of his community. His personal history is deeply intertwined with Alyssa, as he has known her since childhood and has harbored a romantic love for her from a very young age.

His central role in the story is defined by this unrequited love. He constantly seeks Alyssa's attention and attempts to find the right moment to confess his feelings, but his fear of rejection or embarrassment always stops him. Alyssa, for her part, remains completely oblivious to his romantic intentions, genuinely viewing him as a cherished younger brother figure. This dynamic creates the primary source of his personal struggles within the narrative.

Fennel's key relationships all circle back to his feelings for Alyssa. Viola, Alyssa's adoptive daughter, quickly recognizes Fennel as a romantic rival for her mother's affection. However, because he is so ineffectual in his pursuit, Viola does not see him as a serious threat. Instead, she primarily uses his crush as a source of amusement, teasing him mercilessly and taking small opportunities to thwart his advances, such as preventing him from drinking tea made by Alyssa. Auri, Alyssa's father, is also aware of Fennel's long-standing crush. While Auri trusts Fennel and would prefer him to a complete stranger, he is also quite realistic and has little faith that the timid elf will ever successfully win his daughter's heart. Outside of this romantic entanglement, Fennel is well-liked, frequently spending his free time drinking and socializing with friends like Grinde.

Throughout the series, Fennel shows little development in his core goal, remaining stuck in his cycle of hopeful planning and last-minute failure. His persistence, despite constant setbacks, becomes a defining and comedic trait. He experiences small moments of victory, such as seizing rare chances to spend time alone with Alyssa when Viola is absent, but his fundamental inability to confess remains unchanged.

Concerning his abilities, Fennel does not display any notable magical or combat prowess. His skills lie in his profession as a merchant, where his eloquence and trustworthiness make him successful in trade. One of his more notable actions, taken at considerable personal risk, was attempting to set up a blind date between Viola and a friend, demonstrating his willingness to involve himself in chaotic family matters despite his typically cautious nature.