To have multiple lines as the display name of an NPC follow the following steps:
- download the FancyHolograms plugin and put it in the plugins folder
- start your server and make sure the FancyNpcs and FancyHolograms plugin have both loaded
- create a hologram with multiple lines
- create a npc
- link the hologram with the npc
/hologram edit <hologram> linkWithNpc <npc>
- you can now move the npc around and the hologram will always follow
- to unlink simply run
/hologram edit <hologram> unlinkWithNpc