Ena Banshōya attended Yurigaoka Girls Academy. Recruited into the first-generation Alfheim Legion during her first year, she achieved significant accomplishments. Following Alfheim's disbandment, Ena accepted an offer from her roommate, Soraha Amano, to join her Legion. This transition triggered a slump where her confidence diminished. Her recovery began when she became a test-wielder for the Einherjar CHARM, an opportunity that helped her regain self-assurance. Alongside Titia Paumgartner, Ena ranks among the first Lilies to fully master the Circlet Bless technique, demonstrating her combat proficiency.

She possesses a talent for teaching and motivating others. Ena maintains friendships with individuals including Moyu Mashima, Miharu Nishikawa from Irma Girls School of Fine Arts, Asagao Fujita from Odaiga Girls School, and Marei Amatsu of Ryuto Girls School. Her relationship with Chihana Takegoshi is characterized as an "eternal rivalry." Kisara Okada served as her Schutzengel. Beyond combat, Ena holds a strong interest in tropical fish, showing particular fondness for protopterus annectens, yet exhibits a pronounced fear of dogs.

Her given name "Ena" combines the characters for "rely on" (依) and "apple tree" (奈). The surname "Banshōya" derives from "master craftsman" (番匠) and "valley" (谷), with "Banshō" further breaking down to "turn/number in a series" (番) and "artisan/carpenter" (匠).

Later, Ena became commander of the second-generation Alfheim Legion at Yurigaoka, indicating her leadership role and continued development within the academy's military structure.