Rize Tedeza hails from a military family, profoundly shaped by her soldier father who drilled her in self-defense from a young age. This forged a disciplined, physically adept personality with a deep appreciation for military gear, including her carried model Glock and combat knife. Contrasting this tough exterior, she harbors a secret fondness for cute things, cosplay, and girly pursuits, often feeling embarrassed when this side surfaces. She fears seeming unrelatable and strives to project an image of a "normal" teenage girl.

Her disciplined demeanor lends her a cool, headstrong, and mature air among peers. She readily offers blunt yet kind advice and naturally assumes leadership, organizing schedules and tasks for others. However, she conceals significant vulnerabilities: a cluster of fears—bugs, thunderstorms, dentists, and darkness—that can trigger freezing or visible fluster. Embarrassment or strong emotion frequently causes her ears to redden.

In "Dear My Sister," Rize becomes central following Cocoa Hoto's absence. Struggling with Cocoa's departure alongside Chino Kafū, she channels her energy into meticulously organizing a Rabbit House cleaning session for Chino, Maya Jōga, and Megumi Natsu, showcasing her reliability and need for structure. Later, believing she was too harsh on Maya and Megu, she confides feelings of loneliness and a wish for Cocoa's return to Chiya Ujimatsu and Syaro Kirima. The special also explores her past with Chino: initially intimidated by Rize's seriousness, Chino grew to value her dependability as both an employee and friend. A poignant revelation involves Chino sharing how Rize handcrafted a stuffed rabbit for her years ago, prompting the others to request their own. Embarrassed, Rize fulfills these requests, creating personalized stuffed rabbits for each girl, including one for Cocoa presented post-credits.

Her relationships are marked by mutual respect and subtle care. She serves as a reliable senpai to Chino, Syaro, and later Maya and Megu. Syaro Kirima harbors a significant crush and deep admiration for her, which Rize gracefully accepts. She shares a childhood friendship with Yura Karade. Rize exhibits protectiveness towards the group, particularly the younger members, and values camaraderie, evident when she openly misses Cocoa and crafts gifts to comfort her friends.

Physically, Rize stands as the tallest main character, possessing a shapely figure, violet tsurime eyes, and long, dark purple wavy hair typically styled in twin-tails with loose bangs. Her Rabbit House uniform is a long black skirt paired with a white blouse, purple waistcoat, and bow tie. Her school uniform consists of a black blouse, white blazer, and a white-and-grey plaid skirt with a matching tie.

She excels in numerous physical and practical domains, including academics, sports like basketball and horseback riding, sewing, and acting. Her competence garners peer admiration, though she has specific weaknesses such as blowing darts. Her habit of naming objects "Wild Geese" extends to pets and plush toys. Professionally, she worked part-time at all three major cafés—Rabbit House, Ama Usa An, and Fleur de Lapin—at various points. Influenced by her interactions with the younger girls (Chimame-tai), she decided to pursue a career as an elementary school teacher.