NPCs - Leiriad/-Neoforge-1.20.1-Inventorium GitHub Wiki
Easy NPC is the tool I use to create characters that assist players in the game and bridge the gap between the vanilla economy and Create: Numismatic.
For example, you can create a banker who will convert diamonds and emeralds into gears, or a vendor who allows players to buy items that are unusually difficult to obtain (impossible crafting, illogical recipes, etc.).