Mongo

Male Mongoliensis · Mongo the Mongoliensis · Mongoliensis · Royal Steed · velociraptor

A full wiki page for this entity is still being generated. Until then, see the recorded facts below.

Sources — 14 recorded facts, by chapter

Chapter 46

Mongo is a pet-class Mongoliensis, a roughly seven-inch-tall pink-feathered chicken-dinosaur with tiny forearms, a serpentine tail, and sharp teeth, that Donut chooses from the pet reward room.
The Mongoliensis is a stubborn, hot-headed pet that can never truly be tamed, becomes powerful, fast, and vicious at level 15, and will immediately attack any mob it sees and fight to the death.
Carl frees Mongo from his cage using the Master Pen Key, and Donut names the male creature Mongo, though it repeatedly bites and snaps at her.
Mongo had not yet bonded with a crawler, and Carl warns he will teleport away if they enter Mordecai's room before the bonding occurs.

Chapter 47

Mongo is a dinosaur-like pet creature (described as a chicken-like Mongoliensis) won from the second-floor boss fight whom Donut must bond with.
He repeatedly bites Donut on the nose and constantly tries to bite Carl, and he can teleport away when frightened.
He is a pack hunter who learns to kill by example, mastering brindle grubs alongside Donut and ripping open the thorax of downed hornets.
As a pet-class mob he stays level one until bonded, then will level rapidly and become physically mature, fully grown at level 15 but able to grow stronger beyond that.
Donut officially bonds with and names him after he is endangered by a vespa, and his dot turns orange and his title becomes Royal Steed.
He is very food-motivated, loves pet biscuits, and learns dog commands including 'attack,' 'come,' 'lie down,' and a charge command that evolved into 'sic 'em.'

Chapter 48

Mongo is revealed to be a Mongoliensis, which translates to what humans called a velociraptor, explaining his pink feathers and beak.
Mongo is described as a common creature seeded across human worlds before humanity develops, beloved by human children.
Mongo bit off part of the production assistant Lexis's finger and destroyed a bow tie within seconds.
If kept alive and leveled up under Donut's control, Mongo will grow into a vicious full-grown fighter.