Hi Evan! Thanks for your comment, I'm glad you like it :)
Minifantasy is a community-driven project, so I don’t really decide myself what the next asset pack (or Patreon exclusive content) will be about.
The way it works is:
Patrons suggest themes and content for new asset packs and other content.
I make monthly polls with their suggestions.
The community decides what I will work on by voting in those polls.
Right now there isn't planned a specific asset pack that will focus solely on such types of creatures, but if the community shows interest in it, sure I will work in something like that :)
I hope this answers your question. Have a nice day!