Claiomh Everlasting is a noble-born teenage girl possessing fair skin, long blonde hair, pale blue eyes, and distinctive disheveled bangs featuring signature twirled locks on each side of her head. Her sheltered upbringing gives way to adventure when she departs boarding school to join the sorcerer Orphen on his travels.

Her possessions include two key artifacts: the Sword of Baltanders, entrusted by her father as an inheritance, and a Deep Dragon cub named Leki, whom she adopts and frequently carries in her backpack. The Sword of Baltanders acts as both a weapon and a link to her family, driving her insistence on accompanying Orphen to secure its eventual return. Initially carefree and occasionally brash, she frequently clashes with Orphen due to stubbornness and a reluctance to admit fault, a dynamic masking her underlying affection and respect for him.

Her character demonstrates significant evolution. She trains with a longsword, becoming a proficient fencer capable of dueling skilled opponents like Heartia (disguised as Black Tiger) and toppling magical constructs such as golems through physical prowess. Beyond martial skills, she possesses latent magical potential unleashed when Leki merges his consciousness with hers, enabling her to channel magic through him as a medium. She later undergoes formal sorcery training under Leticia at the Tower of Fang, completing her studies within a year and gaining additional proficiency in firearms.

Her relationship with Orphen evolves from contentious travel companions to romantic partners. They eventually marry, settling on the Hara Continent where they have three daughters: Ratsbane, Edge, and Ratchet. In later life, she supports Orphen’s establishment of the Swedenborge School of Sorcery, cementing her role in the series' broader legacy.