To add new peds, use fastman's limit adjuster plugin.

Here is a tutorial:

https://www.youtube.com/watch?v=KSzGUf1qMMo&ab_channel=WhamDieMoe

Add this line into peds.ide file.

***, CWFYHB3, CWFYHB3, CIVFEMALE, STAT_TOUGH_GIRL, woman, 1100, 0, man, 1, 1, PED_TYPE_GEN, VOICE_GEN_DWFYLC1, VOICE_GEN_DWFYLC2
***, WFYBE2, WFYBE2, CIVFEMALE, STAT_COWARD, woman, 1080, 0, beach, 1, 4, PED_TYPE_GEN, VOICE_GEN_WFYBE, VOICE_GEN_WFYBE


Don't forget to enter ID you want ped to have.