The majority of these characters are spawned with the spawn book, or with waves if the mod includes it. You need custom avatar framework installed if you don't have it already. Basically, you find it in the spawn book and press spawn to make an npc or equip to become the character. If there is a wave included in the mod it should be somewhere in the wave spawn book.
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https://www.nexusmods.com/bladeandsorcery/mods/3822