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.

***, BMYST2, BMYST2, CIVMALE, STAT_GEEK_GUY, man, 100F, 1, null, 0, 3, PED_TYPE_GEN, VOICE_GEN_BMYST, VOICE_GEN_BMYST
***, HFYBU3, HFYBU3, CIVFEMALE, STAT_SUIT_GIRL, busywoman, 4, 0, man, 3, 7, PED_TYPE_GEN, VOICE_GEN_WFYBU, VOICE_GEN_WFYBU
***, SWFYRI3, SWFYRI3, CIVFEMALE, STAT_SHOPPER, woman, 1000, 0, null, 4, 6, PED_TYPE_GEN, VOICE_GEN_SWFYRI, VOICE_GEN_SWFYRI




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