How to add npcs(other than platforms) to lineguides?

[Mosaic]

Given that we don't use pnpc anymore, and you needed this in the original lineguide to add things to platforms, such as springs, blocks, power ups, or the like. How do you do this now? Like how is this programmed in? Is it even possible to program other npcs on now? An answer would really help, thanks!

[Enjl]

ctrl f "lineguided" https://docs.codehaus.moe/#/features/npc-config

[Mosaic]

ctrl f "lineguided" https://docs.codehaus.moe/#/features/npc-config

I...actually knew something like this existed, but had no idea how many of these commands existed or what they were called, thanks for the list though.