Mirai Asuka features turquoise-green eyes and scarlet-crimson hair styled in two low pigtails secured by yellow bows, with loose strands and thick bangs split into three sections. Earlier at Star Harmony Academy, she wore higher pigtails with purple bows. Her look includes pony and knotted bow accessories shared with Ichigo. At 165cm, she stands as the tallest main character in her series. Personality-wise, she embodies a charismatic "differ-cute" fashion leadership style, actively showcased on Friendstagram. She tracks trends through social media and documents daily life via photography. As a model idol, she relentlessly pursues self-improvement and individual expression. Typically energetic and eccentric, she reveals critical insight during professional challenges—like confronting Mio Minato after Pure Palette’s Brilliant Friends Cup loss over underutilizing Aine Yūki’s potential. Her catchphrase, "No dress, no life!", defines her fashion-centric ethos.

Graduating from Star Harmony Academy, she formed the top idol unit Love Me Tear with Karen Kamishiro, winning the Diamond Friends Cup. Later, she leveraged her dual experience as designer and muse for her self-founded brand Milky Joker—ninth idol-created brand in the franchise—to launch "Mirai’s Miracle Audition" for nurturing new talent, where Wakaba Harukaze emerged as winner. Key relationships include Karen as unit partner and close friend, sharing a numerological bond: their birthdays (May 9 and October 4) both sum to 14, interpreted as "stone" in Japanese, reinforcing their Diamond Friends status. She mentors Aine Yūki as a junior idol, finding her intriguing, while Hibiki Tenshō serves as both friend and rival after competing against her and Alicia Charlotte in a prior Diamond Friends Cup. Wakaba develops under her tutelage through the audition.

Trivia notes her May 9 birthday coincides with Japan’s "Makeup Day" (a phonetic play on "meiku"), aligning with her fashion icon status. She favors sweets—especially popcorn—but dislikes black coffee. Golf is her specialty activity. She shares her first name with Mirai Momoyama and Mirai Asahina, and her surname with Momoko Asuka. Her zodiac is Taurus. Key quotes underscore partnership philosophy: "The moment you lost faith in your partner, your Friends is over" and "When 'Friends' become their own greatest rivals, they can climb all the way to the stars. This is how one plus one becomes infinity."