Assistants are NPCs that can be hired and placed in your player-owned house. Each assistant has its own specialty, which determines what items they can craft for you. As you craft items, you will gain experience and level up that assistant's Closeness, with each level unlocking more craftable items.
The better your assistant's mood is, the faster they will craft items for you.
Select one of the above assistants to view its biographical information and which items its crafting recipes.