If you are indeed doing a TLC Phase 3, there are 3 creatures that me and probably hundreds of other people think deserve more love than ever...(This is in a PVE Sense.)
1. Megalodon: It looks like it has a baby's face, it is fairly useless once you get a Tusoteuthis or a Mosasaur, and it overall just seems unworthy of it's title. MEGAlodon. Make it bigger if possible. And definitely give it a new look. Also, I say give it an attack where it leaps up out of the water and can grab prey from midair or on the edges of the beach (Specifically Pelagornis or Seagulls.) Or give it a sense of smell like a dire wolf. Where it sees corpses and can see where they are.
2. Brontosaurus: It's face looks warped and weird, It's weak compared to other herbivores in my case, and it only has one VERY big (a o e) attack. It may be an amazing berry gatherer and a good mobile base, but that's it. Try giving it a stomp attack where it rears up like a Titanosaur. Maybe give it a better appearance as well. Or possibly add an passive ability where it can become stronger the smaller the opponent. It can have a limit as well. And maybe give it an ability where it can has a garden on it's saddle. Essentially making it a mobile Garden!
3. Stegosaurus: It has the slowest movement speed out of all the rideable herbivores in my opinion, and it only has one attack, and it's walking/running animation is a bit off. Maybe give it an ability where it can grab things like the Kentrosaur. Or maybe give it a buff where the blood flows into the dorsal plates and gives it extra defense, or a speed boost. Or, you can add a pack bonus like Allosaurus. The leader will get a buff and can encourage it's fellow pack mates to fight on with a roar or something. The buff will be a 30 second speed and defense boost. Or an attack boost.
If you read this, thank you.
Sincerely: A man named Jaiden.