Imas Triviaさんのイラストまとめ

1st pic: Sachiko Koshimizu's parents
2nd pic: Seiji Shingen's niece, Amane
3rd pic: Rei Kagura's older sister
4th pic: Kuro Kiyosumi's grandpa

In Miyo's first SSR, the car is Acura/Honda NSX

Tamaki Ogami's cat (kobun)

Momoka Sakurai's Papillon dogs
Kirio Nekoyanagi's goldfish (Maru)
Shoma Hanamura's goldfish (Kin-chan)
Kuro Kiyosumi's goldfish (Chachata)

1st pic: Hibiki Ganaha's older brother (playing the shamisen)
2nd pic: Subaru Nagayoshi's 2nd, 3rd, 1st, and 4th older brothers (age arranged from left to right, hint is the lines on the chopstick)

Hideo's car is a Toyota Voxy

Minori's bike is a YAMAHA SR400

315pro's company car in the game is a Volkswagen 2013 Kombi Last Edition

Hokuto's car is confirmed to be a Lotus Evora S based on the car keys and seat design. The color of his car's exterior is unknown.
https://t.co/DxYPOu3UKy

Minori Watanabe's sweater