For any wondering, here is the list I have so far for the fem primarchs and their monstrous transformations/"true forms"
Freya(Leman)- Wolfen
Atlantia(Angron)- Lioness deamon
Cora(Corvus)- Crow deamon
Mortica(Mortarion)-Insectiod (preying mantis, centipede, fly)
Hestia(Vulkan)- A giant salamander dragon (no wings)
Ferra(Ferrus Manus)-Necron reserected (biotransferance)
Sanguinia(Sanguinius)- Mantacore but snow lepord instead of lion
Fulgrim- Deep sea fish/siren
Kassandra(Konrad)- Vampire Bat
Magnolia(Magnus)- elder mummy litch or Owl+Peacock?
Jagathai- actual war hawk or cheeta?
Petra(Perturabo)- ?
Hathor(Horus)- ?
Renala(Rogal Dorn)- ?
The Lioness (The Lion)- Chimaera
Juno(Robuté Guilliman)- Bovine/Cow/Minotaur
Arellia(Logar)-?
Alpharia/Omega(Alpharius and Omegon)- ?
If you couldn't tell, this is not a complete list! And for the question mark ones, please feel free to submit ur ideas! (I am trying to avoid the obvious choices, i.e., The Lioness being a lion, but I'm open if you have a unique spin)
This project is a community share alike, so if u wanna use these designs in ur artwork, go for it! I really want this to be a group effort!!!
Sorry I just went and spammed a ton a yas I'm low key just trying to follow all 24 people in the newsies fandom on tumblr rn lol