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.

***, SWFYRI2, SWFYRI2, CIVFEMALE, STAT_STREET_GIRL, woman, 1000, 0, null, 4, 6, PED_TYPE_GEN, VOICE_GEN_SWFYRI, VOICE_GEN_SWFYRI
***, HFYBU, HFYBU, CIVFEMALE, STAT_SUIT_GIRL, busywoman, 4, 0, man, 3, 7, PED_TYPE_GEN, VOICE_GEN_BFYBU, VOICE_GEN_BFYBU


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