Shoptown Residents

It'd be neat if we could speak to our conjured creatures. Beyond giving them simple instructions, it would be a good opportunity to allow some direct lore exploration from some characters we'd have few chances to speak to without very specific plots.

"how come we dont get (insert idea)"

you have the power to make things yourself and thanks to the public domain you can sell it to people.

The concept of copyright and conlangs can be tricky but many, especially more modern ones do fall into copyrighted territory. Like im sure you can get away with your characters speaking klingon idk as a joke or in a throwaway line but if its an integral part of your story "oh heres aliens who speak klingon" id imagine Paramount wouldnt be too happy.

Klingon and Dothraki are also trademarks so thats a no go.

So what can you use? if you were so inclined?

Well older conlangs like Esperanto or Ido were made in the 1800s and are therefore fair game in fact one of the reasons Esperanto is among the most successful conlangs is because it could be freely adapted and changed over time.

Balaibalan, one of the earliest conlangs ever recorded which was made sometime between the 14th and 16th century. It was meant to be the word of god. If you wanna know more I recommend this video.

Enochian, created by John Dee in 1583. This one was made to be like angelic speech. Here's another video if you wanna learn about that one.

While not a conlang, I'd be remiss if I didnt mention Hildegard of Bingen, the german nun who lived from 1098 to 1179. She made an alternative alphabet which is called Lingua ignota. She's kind of the patron saint of conlangers, I love her.

Those things could fit right in your works and def can be used freely.

Conlanging is a fairly new thing in the grand scheme of things, historically it was often in connection to religion as you can see by the examples but from the 1800s onwards things like Esperanto came onto the scene then the works of Tolkien which inspired more and more and of course like many things exploded with the internet.