(Hello! Some Characters are Vocaloids, others are Regular Sekai Characters. I put them as who I think they best share Personality with!)
Muichiro (Hatsune Miku): “ I'm thinking Muiku, Muiku, Oo ee oo ” He puts his hands on his hips and Looks at the others, Only some were listening though
Tanjiro (Len): “ I don't know if... ” He trailed off and then Decided to stay quiet
Nezuko (Rin): “ Thats Awesome, Tokito! ” She smiled and jumped up and down in Excitement (Yes,She can talk)
Giyu (Mafuyu): “ ... ” He sighed quietly and listened to Mitsuri and Rengoku talking
Mitsuri (Emu): “ WONDERHOY!! Rengoku-San, wanna go to the Cafe Later? ” She tugged on Rengoku’s Sleeve in excitement
Kyojuro (Saki): “ Why of course Kanroji-Chan! ” He put his hands on his hips and smiled proudly
Obanai (Rui): “ ... ” Staring at Mitsuri talking to Rengoku and Giyu, slightly Jealous
Sanemi (Tsukasa): “ Woah! Iguro, are you okay there buddy? ” He raised an eyebrow slightly and patted Obanai’s shoulder
Tengen (KAITO): “ Well Shinobu, That sounds Rather Interesting! ” He nodded slightly and smiled at Shinobu
Shinobu (Mizuki): “ Arigato, Uzui-San.. ” She bowed slightly. Who knew what they were talking about?
Gyomei (Haruka): “ ... ” He was quietly listening to Muichiro
(You can be any PJSK Character not in Use, And you can also call Muichiro “ Hatsune Muiku ” or “ Hatsune Muichiro ” He will still respond [I think])