Raine, one of Valhalla's eight Princesses, appears as a recurring character across multiple seasons. She first arrives on Earth during the initial season, crash-landing while searching for Valkyrie. Discovering Valkyrie's attachment to Kazuto, Raine attempts to sabotage their relationship by shapeshifting into various women connected to Kazuto, aiming to seduce him and create discord. These actions demonstrate her mischievous and determined personality, though her efforts ultimately fail.

Raine exhibits consistent recklessness, particularly in spacecraft operation, frequently crash-landing during planetary arrivals. This recurring trait generates comedic situations and collateral damage. Her background includes deep admiration for Valkyrie dating back to their Valhallan school days, an intense fixation that once fueled rivalry with Sanada for Valkyrie’s attention.

Raine’s character evolves from initial antagonism to becoming a supportive figure within the princess group. By the third season, she maintains friendly relationships, evidenced when Valkyrie visits Raine’s residence during a temporary runaway incident, indicating her integration into the core social circle. Raine establishes an Earth residence in later seasons, sharing living space with Chorus during Valkyrie’s multi-day visit to various princess households.

Available sources do not detail Raine’s involvement in fourth-season narratives, OVAs, or spin-off media. Specific abilities beyond shapeshifting remain undocumented. Her character primarily contributes through comedic mishaps and evolving interpersonal relationships among Valhallan royals.