Rain, born Rhaenys Crowder, is the daughter of Count Dimit Crowder. Her father forced her mother out of the family during pregnancy, resulting in their divorce, and Rain was raised solely by her mother. Following her mother's death, Rain abandoned the Crowder name and disowned her father, condemning his treatment of her mother and his subsequent attempt to force her into a political marriage with Mastoma, Salmutaria's second prince, for family advancement. She rejected this arranged marriage and fled her noble lineage.

She possesses light skin, blue hair often tied with a yellow ribbon, and dark green eyes. Her typical attire includes a dark blue dress with a white top, brown skirt, black tights, and brown shoes for dungeon exploration, and a white dress with a brown ribbon, green stockings, and brown shoes otherwise. Despite a youthful appearance, she is 20 years old – the same age as her former teacher and party leader, Yuke Feldio.

Personality-wise, Rain is modest and shy, yet exhibits boldness around Yuke. She harbors intense hatred for Besio Salas, a noble who stalked her, calling him a "fat tub of lard" and rejecting his advances. She maintains unwavering animosity toward her father, Dimit, and uncle, Bran Crowder, for trying to forcibly return her to the family, declaring Dimit a "complete stranger" and threatening to kill him or Bran if they approached her again. Rain has a strong fascination with magical artifacts like magic bags or detecting lanterns and considers herself "Yuke's property."

As the priest/mage of the party Clover, Rain wields a large mana pool enabling consecutive spellcasting without exhaustion. Her abilities encompass advanced healing magic capable of reversing near-fatal injuries and mastery over all elemental magics: earth, fire, wind, water, and ice. She trained under Yuke alongside fellow students Marina and Silk before forming Clover.

Key events include collaborating with Clover to ruin the Crowder family's reputation, destroying all evidence of her lineage through Mamal, and exposing her family's schemes to Prince Mastoma, leading to the marriage arrangement's cancellation. She attacked her uncle Bran with magic during his attempt to forcibly retrieve her. After the Crowder family's downfall, she married Yuke, becoming his first wife to secure protection from her biological family. During a dungeon incident, her voice and a pillar of light guided a missing Yuke back after a two-week disappearance. When her disowned father later exploited Yuke's absence by offering an artifact in exchange for her marriage to Mastoma, Rain accepted a bet contingent on Yuke's survival. Upon Yuke's return, Mastoma acknowledged losing the bet, recognized Rain's marriage to Yuke under Salmutarian customs, and imprisoned Dimit.

Rain maintains close bonds with Clover members, particularly Marina and Silk, though she wishes Marina would hug Yuke "more gently." She holds no resentment toward Jamie, the former Thunder Pike member, despite initial conflicts. Her relationship with antagonist Besio Salas involved threatening him after he aided in her enslavement by Thunder Pike, placing his own slave collar on him and warning him of death if he approached her again.

Trivia notes state her favorite food is mushroom stew. She visually resembles Roxy Migurdia from *Mushoku Tensei* (both sharing blue hair and confronting stalker nobles who face severe consequences), though their roles differ – Roxy mentors her protagonist, while Rain is Yuke's student.