Description
Ren Saionji, the sole daughter of Mayuko and her unnamed father, belongs to the Saionji family. Her father was a close ally of Katherine and Ken Rivington. When Kanata Rivington arrived alone in Japan searching for his missing father, the Saionji family provided him shelter. Though initially wary of Kanata, Ren experienced an immediate attraction upon meeting him. She attends high school and maintains a friendship with her classmate, Wakana.

Ren possesses light pale skin, dark short hair, and brown eyes. Her high school uniform consists of a dark blue jacket over a light brown sweater and white shirt, paired with a dark purple tie, a dark indigo mini skirt, black medium socks, and brown shoes. She frequently carries a blue purse with grey lines. During her part-time role as MFG Angel Number 7, her appearance transforms: she dons a brown wig, an orange tank top labeled "MFG Angel", orange gloves, white underpants (though an animation error in Episode 1 depicted orange underpants), orange short boots, a white necklace with a yellow heart, and a pair of white angel wings. Her status as a high school student means her real name, age, and birthplace are withheld on the MFG official website, listed only as "MFGA №7" with question marks for personal details.

Ren displays a clingy and jealous nature concerning Kanata's interactions with other girls, particularly as his MFG fame grows. This contrasts with her earlier rejection of admirer Shun Aiba, stating she wouldn't date someone who only cared about her looks without knowing her personally, only to fall for Kanata moments later. As an MFG Angel, she expresses reluctance about duties like wearing a bikini due to self-consciousness about her figure and is forced to give a congratulatory kiss to another racer against her will. She initially uses the alias "Angel 7" and the wig during MFG events, leading Kanata to fail to recognize her despite the disguise.

Her relationship with Kanata evolves from living together under her family's roof to marriage two years after the series' main events. Twelve years later, they have two children together. Shun Aiba, another MFG driver, develops unrequited feelings for her as "Angel 7" without realizing her identity, creating a brief love triangle. Ren does not return Shun's feelings.

Ren's character development involves overcoming her initial jealousy and discomfort in the MFG Angel role. An early incident saw her angrily confront Kanata after a race qualification, though she later apologized upon recognizing her behavior was unwarranted. Over time, she becomes more secure in her relationship with Kanata, culminating in their long-term commitment and family life.