The pink stuffed toy on the top shelf belongs to Azuchi Momo, the stuffed panda belongs to Ryuushen, and the ID lanyard belongs to Yashiro Kizuku. The cactus represents Hanabatake Chaika, and the stuffed dragon represents Dola. Then either the makeup stuff is representing both Todoroki Kyouko and Sister Claire, as the two of them used to do talk streams about cosmetics and fashion together, or I might be missing something else here specific to Claire. That's everyone else from SEEDs 1st wave.
The t-shirt on the hanger was a real limited edition product released for the SEEDs24h event in 2018 (image: asset #30128883).