Is there a way to have friendly creatures with dialogue in my doom maps?

[ChicagoTrash]

The only tutorial I've found didn't work.

[DynamiteKaitorn]

For dialogues in DooM, try using this:

 

https://forum.zdoom.org/viewtopic.php?f=39&t=52710

 

To make a "Thing" friendly just give it the friendly flag in your editor. (Provided you use something like X in UDMF or X in Hexen Format)