The pink stuffed toy on the top shelf (Kaniyama) 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. Add those to the three faces on the cushions and that's everyone else from SEEDs 1st wave. The three who appear in person in this image were all the group's retirees at the time (Izumo Kasumi and Azuchi Momo have since gone, too).
The t-shirt on the hanger was a real limited edition product released for the SEEDs24h event in 2018 (image: asset #30128883).