List of Yo-kai by Manga Debut
Volume 1
Whisper, Happierre, Jibanyan, Dismarelda, Mochismo, Wazzat, Baku, Noko, Negatibuzz
Volume 2
Roughraff, Baddinyan, Daiz, Negasus, Sproink, Coughkoff, Thornyan, Cadin, Shogunyan, Noway
Volume 3
Tattletell, Hungorge, Goruma, Manjimutt, Dimmy, Sproink, Snotsolong, Dianyan
Volume 4
Cupistol, Blazion, Suspicioni, Gargaros, Steppa, Cutta-nah, Blowkade, Robonyan, Dimmy, Illoo
Volume 5
Frostina, Timidevil/Beelzebold (they appear in the same chapter), Everfore, Karakasaobake, Aperican, Hitotsumekozou, Nopperabou, Ittangomen, Ukiukibi, Ake
Volume 6
Suikanyan, Sunao, Drizzle, Hareotoko, Cheeksqueek, Espy, Pupsicle, Agon, Dandoodle, Tsuragawari, Kizunameko, Pandle, Asekkaki
Volume 7
Venoct, Jetnyan, Jigajiisan, Gush, Bikkiyaku, Gabunyan, Rokurokubi, Fusafusan, Chippa, Monomanekin, Whisbei
Volume 8
USApyon, Jikochuu, Hungramps, Hanahojin, Mad Mountain, Buhu, Dazzabel, Dokidoki, Hidabat, Maskednyan, Blazion, Abodabat