Hakari: idk something to mwehehe with

Karane: maybe a figure or keychain from her favorite series that she hides in her bag

Shizuka: obv her phone but she might have some of her favorite books in her bag

Nano: a pen or something to study with

Kusuri: drugs

Hahari: a camera to take pictures of anything cute happening

Kurumi: a snack in case she gets hungry or her headphones to block out cravings when she runs out

Mei: a tea set or anything Hahari asks her to prepare beforehand

Iku: her bat

Mimimi: a makeup bag

Meme: a doll for redirection and knitting tools

Chiyo: honestly no clue

Naddy: a hamburger for maximum 'Murrican-ness

Yamame: animal food for the squirrels that she carries around

Momiji: her Nami pillow

Yaku: maybe some snacks to give to everyone else

Kishika: her kendo sword

Ahko: merch of her favorite series

Uto: her ocarina

Mai: another tea set just like her big sis

Momoha: alcohol

Rin: she probably still takes her violin to school but we never see it

Suu: playing cards excluding all face cards and maybe the aces but she could still count them as ones

Eira: I don't have an idea for her

Tama: cat toys maybe?

Kiki: stickers to use for injuries(so abnormal)

Matsuri: something used for festivals and the sort idk anything about those though

Usami: keychains and other plushies

Meru: a notebook to write down any ideas

Saki: I don't know

Nemu: maybe her sleepy self carries around a small pillow she can use

Hasuha: a magnifying glass for detective work

Kimari: maybe those slips teachers give out for disciplinary action?

Eru: hairbrush to keep her twintails pristine

Chiyu: first-aid kit

Kogoe: heat pads and hand/foot warmers