Durel holds the position of chief medical officer on the Catian starship, acting as primary physician for Eris and fellow crew. Her duties encompass addressing Eris' unique physiological issues, including countering catnip-induced hyperactivity with taser charges and administering pills to halt Eris' mating season prematurely when it conflicts with diplomatic obligations.

She consistently exhibits a calm, logical, and serious disposition, setting her apart from more playful Catian peers. This professional demeanor carries into her diplomatic engagements with the Japanese government, where she participates in negotiations without hesitation. Notably, she wears revealing school swimsuits during official meetings without discomfort, commenting they make her "feel a bit frisky," and deliberately employs her feminine charms to further diplomatic goals.

Physically, Durel has fair skin, dark green eyes, and dark brown hair. She stands 188 cm (6'2") tall—significantly taller than Eris—with figure measurements of 98-61-87 cm (39"-24"-34"). Her bust size is the second largest aboard the ship, surpassed only by Captain Kuune.

Outside medicine, she displays proficiency in strategic games such as shogi and poker. She admires human cultural traditions, especially the generosity linked to Christmas gift-giving, and actively promotes adopting similar festivals in Catian society.