Kou Mariya as
herself
Mono Monet = PiCKY (
Twitter,
Twitch), based on tracking follows and side-by-side laugh comparison + DJ stuff + some of her old fans on /vt/
Yae Yuguri = Marna Tomochika (
Twitter,
Twitch), based on shared mod, old donator retweets, VA interests, Splatoon, NIKKE, JP ability and tendency,
speech pattern with high pitched "mhm" and tendency to pitch up. You can hear her deeper voice in the first 5s of
her old lore video.
Biscotti = Ham (
Twitter,
Twitch), based on mods and side-by-side laugh comparison