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.

***, WFYBU2, WFYBU2, CIVFEMALE, STAT_SUIT_GIRL, busywoman, 120C, 1, man, 9, 2, PED_TYPE_GEN, VOICE_GEN_WFYBU, VOICE_GEN_WFYBU
***, BFYDJ, BFYDJ, CIVFEMALE, STAT_STREET_GIRL, woman, 1000, 0, null, 4, 6, PED_TYPE_GEN, VOICE_GEN_WFYST, VOICE_GEN_WFYST
***, VWFYST2, VWFYST2, CIVFEMALE, STAT_STREET_GIRL, woman, 1000, 0, man, 1, 4, PED_TYPE_GEN, VOICE_GEN_VWFYST1, VOICE_GEN_VWFYST1

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