Selene is ordinarily a shy and nervous young woman, but tries her best to be friendly despite this.  Selene has a secret: She has the curse of the were-loon, and can will herself to transform into a rubbery, inflatable monster girl.  When turned into a were-loon, Selene is arrogant, outgoing, and dominant, toying with people and inflating both herself and them.   She can return to her normal human form by willing herself to do so.

A timid woman, touched by the were-loon curse

Formed from an experiment which fused Yang (from RWBY) and Mordred (from Fate), Moya is cheerful and energetic, but also prideful and haughty.  Flippant, never thinking of failure, and extroverted, Moya has a regal bearing... most of the time.  The experiment which fused Moya together also allowed her body to stretch and contort like elastic, as well as inflate.  As Moya is two people merged into one body, she refers to herself as "we."

A stretchy, inflatable tomboy fusion (but why?)

Ruby is open and honest, to the point where she has difficulty picking up on social cues.  Despite her naivety she is intelligent and caring, and can be dependable when needed.  Socially awkward but far from shy, she becomes very good friends with people who share her passions and enthusiasm.  After discovering a "unique" application of her Semblance, she has taken to inflating herself with air and other gases for fun.  A graduate of Beacon Academy, she works as a Huntress.