Unicorns and African types.

Well, don't see many platypus TF stories. Also not many cryptid TF stories either (Jersey Devil, Chupacabra, loch ness monster, etc).

The world could use more unusual chimeric TFs too. Like a chicken/cow hippogryph. Or a hippodragon. Or a Poodlesaurus Rex. :P

Ok that last one was really running with the journal title more than species I'd like to see more of in stories. x3

Chimeric crearures would be really cool to see! Especially with the cratlleativity that could come out of it. You'd almost have to design a new anatomical structure in some cases but that's where the fun would come in!

I'm thinking of Phoenix's and wyverns

I have to admit the idea of chimeric transformations does sound interesting, there are all sorts of fun combinations that can come from such things.

Possums, pine marten, muntjac deer, jerboa, wombats.

Just to name a few.

Karkadann - one of my favorite creatures (see: https://en.wikipedia.org/wiki/Karkadann)

Hmm...... a TFTG of a man to mermaid? Intriguing the predicament of being changed say at home unable to get to shore on your own.

I say post the bugs

Bugs too! It just one of those things that always feel risky to do but really rewarding when it's well done.

+1 to that!

always looking for good bug TF's. It's too rare to find good stories with that kind of transformation.

Pangolins, sheep, seals, antelopes!

Bugs, definitely. Especially if they slowly change into one and their mind with it.
Idea: dirty bomb goes off at a remote school. Everyone is evacuated to a nearby field full of flowers. Initially, everyone huddles under a grove of trees, but then they turn into bumble bees. The principal would become the queen and the vice principal a drone to start egg production. There would be an initial panic, but then instinct kicks in as their clothes fell off from them rapidly shrinking. They don't start changing until they are less than a foot high. They change as they reach proper bee size and they make a hive in a bee hive box that was left in the field. It ends with all the new bees doing what bees do and a truck arriving to take them away as planned.

But I don't see much cephalopods or mollusks (bivalves in particular). One such story could revolve around someone getting a nipple piercing with a pearl on it and turn into a clam by folding over it while wanting to protect it or whatever oysters like to do.

Erotic raccoon stories are uncommon.
Not a lot of seal or walrus stories
Anemone could work if you had someone else turn into a clown fish with them. Probably at a zoo laboratory where they "aquire" new specimens.

I have more I could come with if you need more.

Ive seen very few rhino, elephant, hippo transformations
Bugs is a big one, both anthro and feral, rarely seen them.
Opossums and Koalas could use some story love.

Hydras

From SC2?

Yeah, but also the greek style

Chinchillas, armadillos, lemmings would be interesting to see.

On the topic of bugs, butterflies are something I think could be cool and a topic I haven't seen a lot of.

Man to meme.

I should get to work on my own space raptor species so people will hop on the train for that 'n get some tf for em.

Excuse me, I think I'm scheduled for a rock-pelting at the gallows today.

I always wanted some peacock and giraffe TFs as they were absolutely none for a long while until recently, first has a gorgeous tail and another a pretty long neck, both pretty unusual features. Anyways, I just would love to see or read TFs into creatures that have some more unique features be it trunks or whatever. Also, hydra transformations, multiple heads have lots of potential.

Nudibranchs?

Platypus, and other non-roo marsupials would be nice. Theres a lot of anatomy differences that can be interesting. I also would love to see more unique stuff like Pangolin, Okapi, Anteaters and Porcupine. opposum are really common and almost never used compared to other american mammals.

And overall I just wish there were more Bats though at least they are more common than the others I mention.

I love insect and plant critter tfs but they tend to squick people sadly.

Insects bug people...pun intended?
(I personally love insecty stories, just to note.)

Very much intended!

I applaud you, good sir.
And looking at other responses I'd agree with fungus.

Eels, springhare, and fungus.

I haven't seen a whole ton of Fungus stuff, even if anthro there's massive potential there.
More insect TFs are a fun idea too, there's so much potential with hives, hive minds, and more.
Hydra stuff and some of the more ignored Pokemon like Cacturne could be fun as well.