[Tigairius]

I did one for Delteria Dev, but I don't know if they would be willing to share the script.

As said in this thread, just use attachplayertoobj; I don't recommend using dontblock and drawoverplayer/underplayer solely and that is because it would look odd if you see someone walking across a bridge but it would be draw over player for you since you wouldn't be on the bridge.

The best way to do it is attachplayertoobj and detachplayer. Of course, if we ever got properly working tile layers this would simply be done with a level editor and no complex NPCs involved.