This is going off the common hair chart where:
1 = straight hair
2 = wavy hair
3 = curly hair
4 = coily hair

It is possible to have more than one hair type on your head, for example, I'm probably both 2c and 3a, especially pretending on the day.

I'm also only gonna do girls because, no hate on guys, but I've never seen a hair chart with male examples for each hair type so I don't have a reference like I do with the girls.

One of my female Star Wars characters is excluded because she's an alien species with no hair.

1 (straight hair): Mico Becerra (PJO) and Pyrite (SU)
     - 1/2a: Affinity Darwin (PJO). Depends on the day

2 (wavy hair):
     - a: Monica Mireles (TMNT), Slovakia (Hetalia)
     - b:
     - 2b/2c: Hamato Sistine (TMNT). Depends on the day
     - c: May Fenwick (TMNT)
     - 2c/3a: Shelby Bradford (TMNT). She has a mix

3 (curly hair):
     - a: Iolite (SU)
     - 3a/3b: Rian (Star Wars). She has a mix
     - b: Luana Kameāhola (TMNT)
     - c:

4 (coiled hair)
     - a: Evaelle Trompeur /Souris Blanche (Miraculous)
     - b: Brianna Stockman (TMNT)
     - c: