Note: The creature will also have no lipsync unless the creature has the appropriate data, which I don't know how to add and I hear is a lot of tedious work. I'd recommend you just settle with no lipsync.
Setting Up the NPC
- Note that "Race" box. Leave it as default for now, but we'll be changing it!
- I highly recommend changing the voicetype to a custom one. To make a new voicetype, go to Character>Voicetype and Right Click>New. Name it well, and set the gender to the gender of your creature. Don't check Allow Default Dialogue, unless you have need to. Now go back and change your NPCs voicetype to your new one. Make sure you've clicked OK to the voicetype window, and then closed and reopened the NPC one to see the voicetype in the dropdown.
Figure 1 is an example of my NPC, a troll, who I will eventually make talk.
Setting Up the Race
Go to Character>Race, and search (using the Filter) for the ACTUAL race of your creature. Bethesda is fairly sensible in their naming conventions - the race of a Frost troll is TrollFrostRace, for example. Just filtering for a keyword in the race should allow you to find it relatively easily. I searched for Troll. Searching for Spider yields all the Spider races, Chicken the Chicken race, etc.
When you find your race, right click it and select Duplicate. This will give you a YourRaceNameDUPLICATE00001 or something like that. Double click this new entry to edit it. Now, change the editorID of your race to something pertaining to your mod and the race. Check the box Allow PC Dialogue - VERY IMPORTANT! This is the whole point of what we're doing. Now, if you also want the creature to headtrack you (turn their head to look at you when talking), also check Uses Headtrack Anims.
Also, change Morph Race AND Armor Race to the actual race of your creature. Mine is TrollFrostRace, because my creature is a frost troll. If you were trying to make a talking Frostbite Spider (not giant sized), it would be FrostbiteSpiderRace for both of those. (If you don't set this, your creature will be invisible.) Your race should now look something like Figure 2.