These designs look like they're based on existing characters, but they're not quite cosplay:

• Soyo -> Franka (post #3769658)
• Anon -> (?) Exusiai (post #3563838)
• Tomori -> Plume (post #4187717)
• Raan -> Rosmontis (post #4179709)
• Taki -> Texas (post #3563868)