Curious alien explorer in a space suit, endlessly enthusiastic and often wrong. Opens every book with "Hello Earthlings!" and drives the story through innocent misinterpretation.

Duck, cave/pond setting character being quietly seeded on Instagram ahead of Book 3.

Hippo, comically out of place in a desert/Sahara setting, plays the fish-out-of-water for laughs.

Basic Observation Bot, cube body with orange eye rings, brass details, and a defined rocket flame. Formal and dry like Data from Star Trek, gently corrects Astro's mistakes with scientific accuracy.

Crow with a smooth head and glasses, carries a notepad, the intelligent boss of the crow pairing.

Greenland shark, roughly 400 years old — slow, ancient, unbothered calm as his defining trait (debuted July 2026)

Black and white cow, tongue permanently out, the goofy half of the cow double-act.

Crow with a head tuft, chaotic sidekick to Vinnie, provides most of the crow-based visual comedy.

Brown and white cow, the sensible counterpart to Henry's silliness.

White flamingo with a vegan quirk, adds a distinct personal habit to his comic relief role.