Toma's asymmetric outfit◊. He wears an orange-black striped shirt, but the left sleeve is completely black and ripped, with its tatters covering his left hand. It's a Duality Motif! The left side of him shows signs of his yandere personality that he tries to keep in check.
Aside from the tatters, his outfit is — by far — the most mundane-looking of all the love interests'. (Read: he's the only one whose outfit looks like one you might see somebody wearing on the streets anywhere but in a video game.) Which also fits Toma's character: he comes off as the most normal, down-to-earth love interest at first glance.
On the note of the above post, the character designs in this game are generally full of wonderful details that hint at our love interest's personalities and relationships:
Kent: The high collar and multitude of belts present him as very closed-off.
Ikki: His outfit is halfway between your standard Sharp-Dressed Man look and a visual kei star's outfit; it would not look out of place on a performer. (Early in Ikki's route, Orion even likens him to a pop star.) Either style fits Ikki's personality: both are striking, showy looks that get attention but have a certain class to them.
Childhood friends Shin and Toma dress in similar styles in the realm of street punk, as do the close friends Ikki and Kent (both wear dark, long, closed jackets with their card suit's emblem on the chest).
Shin: Compared to the other love interests and their Playing Card Motifs, Shin's heart theme is much harder to spot on his outfit. In his route, Shin speaks so bluntly to the heroine that Toma deems it cruel and outsiders repeatedly suspect him of mistreating her; yet he's probably the most overt about loving the heroine out of all the characters.
Ukyo: As with Toma above, his mismatched sleeves- one checkered and one solid- give him a Duality Motif, which fits his character quite well.
The heroine's passiveness in Toma's route, as explained in this comment, focusing on the Doubt parameter that is exclusive to his route. While the heroine is mostly passive in his route, several of the answers chosen to reach the Good Ending involve subtly calling Toma out on his actions. From pointing out how he's leaving her alone and asking if he sees her as nothing but a doll, she continuously forces him to see his actions from a different perspective. To see what his insane jealousy has led him to do to her. Compared to the answers chosen to get Bad Ending 2 for him, where the heroine keeps insisting that Toma is still a good guy at heart. She tries to shield her own eyes from his horrible actions, even claiming that everything he does is for her own good, and making her refuse to doubt Toma.
Behavior during Toma's route is also explained by the amount of time the heroine spent in the hospital, which Orion explicitly said was negativity impacting the heroine's mind.
Amnesia: Later has Kent learn how to cook, and he turns out to be very quick to pick things up and realizes a passion for it. Cooking is a very scientific procedure, with chemical reactions altering food's taste, consistency, or even color, and recipes are basically a formula to follow. No wonder a rational mathematician like Kent enjoys it!
The very premise of the game could qualify in a meta-justification sense. In otome reviews, a lot has been made of the typical otome heroine's characterization which some players find feels unnatural. Well, within the game's opening scene and the supernatural groundings of its setting (i.e. spirit collisions leading to amnesia) the heroine's quietness seems realistic. Moreover, when the heroine has recovered her significant memories in the good ending, she actually speaks for herself in dialogue- proving she DOES have a defined personality, which varies somewhat by the route.
Minor one for Amnesia: Later in regards to Ukyo. Characters comment that he can walk on sharp stones while barefoot or eat incredibly spicy food without flinching, with Ukyo admitting that 'this kind of pain' doesn't register for him anymore. It's not some superpower he has attained. It's because Ukyo went across so many timelines and parallel universes, and has died in many, painful ways, that minor discomfort like stones poking his feet or minor stomach cramps just don't compare.
◊. He wears an orange-black striped shirt, but the left sleeve is completely black and ripped, with its tatters covering his left hand. It's a Duality Motif! The left side of him shows signs of his yandere personality that he tries to keep in check.
