Novels like Deluge: hydras can be adventurers too

All share Non-Humanoid Lead

Faceless Hunter: A Shapeshifter LitRPG
4.44
Also Local Protagonist and Survival
The Bloodforged Kin
4.20
Also Local Protagonist and Survival
A Gigantoraptor In A Fantasy World!
4.38
Also Local Protagonist and Survival
Consumer of the Fourth Anchor (A LitRPG Monster Evolution Adventure)
4.48
Also Local Protagonist and LitRPG
The Apprentice of Ouroboros
4.45
Also Local Protagonist and LitRPG
Learning to be a Menace
4.33
Also Local Protagonist and LitRPG
Goblin Teeth: A Monster Party LitRPG (Book One Stubbed)
4.59
Also Local Protagonist and LitRPG
The Scaleforged Legacy
4.47
Also Survival and LitRPG
Cat Girl Evolution
4.64
Also Survival and LitRPG
A Draconic Rebirth
4.59
Also Survival and LitRPG
Fleabag: A Monster Evolution LitRPG
4.59
Also Survival and LitRPG
Dragon Core: The Dragon-Girl Evolution & Princess-Collecting Dungeon Core Isekai LITRPG!
4.57
Also Survival and LitRPG