I'd really enjoy if someone made a plugin where new players get specific items in their inventory like a book with writing in it or other specific items like that. What I'm thinking is that when you do a command, the plugin looks at your inventory, and then uses everything in your inventory for the new player inventories. I'm not really sure if that would work, since I don't know much about coding. Sorry if I'm just being stupid and this is not possible.
Many plugins that do this. Any starter kit plugin, or you can make your own version of this with something like VariableTriggers.