Hi, I know that some of the MSA newcomers are based on inspired by other characters from either SNK and other properties like the following below:
Abigail = Perfecti from Akatsuki Blitzkampf
Red Goblin = Luke Skywalker
MS-Alice = Inspired by Alice in Wonderland
Abigail = Perfecti from Akatsuki Blitzkampf
Dragunov = Yoko Littner
The Professor = Doc Brown
Vatn = Van Helsing
Odette = Ika Musume/Squid Girl
Beatriz = Kanae from Akatsuki Blitzkampf
Veronica = Highway Star from Tōkidenshō Angel Eyes.
Aileen = B. Janet
Navy = Mathilda from Metal Slug Revolution
Elysion = Davy Jones
Esther = Nausicaä
Towa = D.Va from Overwatch
Elena = Lightning Farron from Final Fantasy.
Licht = Anakin Skywalker
Simon = Sinon from Sword Art Online
Anastasia IV = Palutena from Kid Icarus series
Mello = Sergeant Calhoun from Wreck It Ralph
Izabella = Meiko Shiraki from Prison School
Rita = It's either a female Terry Bogard.
Nikita = Anchovy from Girls Un Panzer
Chunyan = Mui Mui and Li Xiangfei while her Special version resembles Chun Li.
Alma = Cham Cham and Felicia
Owen = Shen Woo from KOF
Gemini Twins = NeoGeo 100 Megashock logo
Sho = Rikimaru from Tenchu and Strider Hiryu from Strider.
Halle = Possibly a combination between Abby Yates from Ghostbusters 2016 film and Ash Ketchum.
Molly = Her mech she's riding could be possibly a Ride Armor from Mega Man X series.
Dion = Raidou Kuzunoha the XIV from the Devil Summoner series.
First Baby = Possibly Android 21 from FighterZ
M.D.P.S-Mz 3 = Blue Mary and Android 18.
Franke = Dark Samus Aran mixed with Moira from Overwatch
Louise = Natasha Volkova from Red Alert 3 and Rebecca Chambers from Resident Evil
Teresa = Selene from Underworld
Kelly = Mercy from Overwatch
Vicky = Sakura Kinomoto
Damian = Something from an anime series or possibly a Castlevania character.
All three Metal Device Females (Perche, Ami, and Ulala) = CPUs from Hyperdimension Neptunia
Any missing and thoughts? Because these are only I know their inspirations.
Anyways, not all of them has inspirations but some of them are rip-offs from an existing licensed characters such as Franke which is a bluntant ripoff of Samus Aran.