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.

***, WFYST2, WFYST2, CIVFEMALE, STAT_STREET_GIRL, woman, 100C, 0, null, 4, 6, PED_TYPE_GEN, VOICE_GEN_WFYST, VOICE_GEN_WFYST
***, OMYCH, OMYCH, CIVMALE, STAT_STREET_GUY, man, C, 0, null, 7, 0, PED_TYPE_GEN, VOICE_GEN_WMYCH, VOICE_GEN_WMYCH
***, WFYRI2, WFYRI2, CIVFEMALE, STAT_COWARD, busywoman, 1000, 0, null, 4, 6, PED_TYPE_GEN, VOICE_GEN_WFYRI, VOICE_GEN_WFYRI
***, WFYRI3, WFYRI3,CIVFEMALE, STAT_COWARD, sexywoman, 1000, 0, null, 4, 6, PED_TYPE_GEN, VOICE_GEN_WFYRI, VOICE_GEN_WFYRI


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