Efil

Efil is a half-elf who loves her Master, Kelvin, and cares for him above all else. Despite her breathtaking beauty — a byproduct of her elven blood — she had been a slave ever since her earliest memories, shunned by slave traders and potential customers alike for being afflicted with the Curse of the Flame Dragon King, which caused everything and everyone she touched to burst into flames. She are The first and only slave bought by Kelvin. In love with Kelvin.

When Kelvin met her, however, he decided to buy her on the spot (in the LN; in the manga, he walked away once before encountering her a second time) and spent all his available skill points to purchase the White Magic skill to Rank A to access the spell Sacred Bless in order to flip her curse into a blessing. Ever since then, she has chosen to dedicate herself to his service — as a maid, as a party member, and as a lover.

After joining Kelvin, she lived at the Fairy's Song together with him, where she took up cooking under the tutelage of the proprietress, Clare. Despite eventually raising the Cooking skill to Rank S and effectively surpassing this mentor of hers, she still continues to hold her in high regard and helps out at the inn every once in a while.

When Kelvin purchased his residence, he officially instated Efil as Head Maid, a position which put her in charge of the new hires, Ellie and Ruka.

Efil's main fighting style involves using a bow and Red Magic. Noteworthy attacks that she had developed by herself include Pyrohydra and Blaze Arrow.

Appearance
Efil always wears a maid outfit, the base of which was a hand-me-down from Clare's daughter, but which she had then modified repeating along with her growing proficiency with the Sewing skill. As of Volume 4 of the LN, she is wearing the Rank S Battle Maid Uniform V.

On her neck is the Slave Collar from her days as a slave. She refuses to take this off despite repeated exhortations from Kelvin as she thinks it a symbol of her dedication to him.

On her head is the Magical Jewel Hair Clip that once belonged to her mother, Rumil, as handed to her by Nellas in the Village of Elves.

Personality
Efil is generally dedicated and a hard worker. She has a tendency to push herself too far when it comes to taking care of Kelvin — only after she collapsed once did she finally accept the other party members' entreaties to hire more maids.

However, when it comes to what she perceives as "duties of a maid" — ex. cooking, sewing, cleaning — she holds herself, and her subordinate maids, to extremely high standards. Her instruction style has been described to be to the point, easy to understand, and kind yet firm.

When the topic of her feelings for Kelvin comes up, she tends to blush furiously and turn extremely embarrassed. However, it has been hinted that she is rather forward in bed.

Trivia

 * Efil's mother is an elf named Rumil. As of Vol 3 of the LN, her father is as yet unknown, but it seems that the Flame Dragon King is involved in some way.
 * Efil is not technically one of Kelvin's Follower (in the context of his Summoning skill). As such, she does not have native access to the Follower Network. However, there is constantly a tiny clone of Clotho on her person at all times, through which she gains full and complete access.