I'm not an expert, but here are my educated guesses:
1. Mauve single factor dominant pied male.
2. Light green single factor or double factor dominant pied male.
3. Sky blue yellowface I recessive pied greywing hen. Possibly also spangle due to absence of wing markings. Can you show more photos of the wings and tail?
4. Light green or light grey-green greywing male.
Here's a helpful colors and mutations website: https://www.cutelittlebirdiesaviary.c...lor-guide.html