These are all original characters from artist's "Flobullet" project. I can't find official romanizations for all their names, though.

Foreground left to right:

• キャネ・ベザラート -- literal romanization would be Kyane Bezaraato, official unknown (seen also in post #10366305, post #10366320)
• Harly Whealer
• Entrojessie Monica

Background left to right:

• サテニア・グレイダスト -- Satenia Graydust -- last name is official, first is not (seen also in post #4446106)
• スヴァラン・ジースター -- Svalan Jiisutaa -- first name is official, last is not (seen also in post #10366359)

Sources:
Names in kana: https://watakokyu.fanbox.cc/posts/8550968 and titles/commentary on solo pictures
"Harly Whealer": asset #38145272
"Entrojessie Monica": asset #38145271
"Svalan": https://watakokyu.fanbox.cc/posts/7103176 / asset #12500151
"Graydust": inferred from asset #38145273 + asset #38145271 mentioning サテニア