Futaba is a teenage girl with straight hip-length black hair dyed bright orange, with straight-cut bangs and two long strands in the front along with a single small, thin strand at the top. Her brown eyes also seem to have some faint purple tones in them, appearing mauve. She wears large black circular glasses, and is almost always seen wearing a set of AKG K845BT headphones with red ear cushions. She seems to be very short, even compared to other girls. Her casual winter outfit consists of multiple layers; she wears an off-shoulder white top with a red splatter-like pattern on her chest with five white asterisks in the red splatter, a black tank top underneath, a dark green jacket with a faux fur trimmed hood, black short shorts, a studded black belt in a slanted position, black thigh high socks and black knee-high boots with buckles and studs at the top. Futaba is incredibly intelligent and has immense technological prowess, but due to her isolation, she has very little social skills and strong anxiety. Even after her change of heart, she still has social anxiety and gets uncomfortable in crowded places. She loves computers, and seems to have some experience putting them together. She doesn't care about mundane topics, but gets extremely invested and passionate when talking about a topic she likes.

Sojiro is a middle-aged man. He has slicked-back dark hair with a receding hairline, gray eyes, a chinstrap beard with a goatee that flares out and wears glasses. His usual outfit consists of a pale pink dress shirt with the sleeves rolled up, pale khakis held up with a white leather belt and white loafers. While working at Leblanc, he wears a black apron with a white pinstripe design on it and has his pants legs folded up to mid calf. Sojiro is cold and strict to Guest upon first meeting them, begrudgingly taking them in as a favor to a friend. Like many characters in the beginning of the story, he is cautious of them due to their probation, even stating that he will do very little if Guest gets themselves into trouble and threatens to kick them out if they violate their probation and does not appear to be willing to hear Guest's side of the story in good faith. He is a rather cynical person, warning Guest that they should be careful who their friends are and chastising them for getting involved in the affairs of others, even if they were trying to do the right thing. However, Sojiro seems to have a soft spot for cats, as he instantly changed his mind about throwing Morgana out of the house, after hearing him meow, claiming that he was "just too damn cute." He also made him something to eat right away, despite claiming that feeding him was Guest's responsibility. However, as Guest continues to live with him, Sojiro slowly builds trust in them, beginning to teach them to make Leblanc's signature coffee and curry. He also begins to joke around with Guest more, seeing that they are not the delinquent that their probation makes them seem like. Eventually, he opens up to them about his past with Wakaba Isshiki and her daughter, Futaba, up to and including why he took in the latter after the former's death. Sojiro is a very smooth talker and often charms women with choice words, stating that he was "quite the ladies man" in his youth. He provides Guest advice for White Day, outlining a plan that he says is sure to impress their date, even allowing Guest to take advantage of the connections he has in the restaurant industry. Despite this, Sojiro has never been married and has only truly loved one person: Wakaba. Wakaba's "suicide" became one of his biggest regrets in his life, due to the fact that he took her warning that she may die soon as a joke. It is also part of the reason why he adopted her daughter, Futaba. Despite the life she lives as a shut-in, he allows her to do so knowing that her mother's death haunts her and to atone for doing nothing even after Wakaba foresaw her impending death. At times, he wonders if he really is the best person to raise her. After Guest helps Futaba to leave the Sakura residence and learning of both of their involvement in the Phantom Thieves, he begins to stand up for Guest and becomes supportive of their efforts due to their goal of taking down Masayoshi Shido, a man responsible for Wakaba's death. Once he finds out that Guest and Futaba (along with all their other friends) are part of the Phantom Thieves, he accepts it and promises to keep their secret, despite them being some of the most wanted people in Japan at that point. This is largely due to the fact that he always suspected that there was something more behind Wakaba's death, but kept his nose down because he did not have any real evidence.