The complete Rotmon encyclopedia — an introduction

Why this exists The Rotmon roster grew from twelve starter designs in early 2025 to over one hundred catchable creatures in mid-2026, and that growth happened without a coherent encyclopedia anyone could read top to bottom. This article is that encyclopedia, condensed. It is meant to be read on the bus or over a coffee, not consulted for individual entries — that is what the [Rotmon guide](/rotmons) is for.

The design philosophy in one paragraph Every Rotmon in the dex must clear three internal checks before it ships. It has to be legible at thumbnail size (because most players see it as a dot on the map first). It has to carry a single catchphrase that reads without context (because the catchphrase appears in the catch animation, the share card, and the dex entry). And it has to fit cleanly into one of the five Regions defined in our [universe and lore guide](/world). If a pitched design fails any of those checks, it gets reworked or shelved.

The five rarity tiers, in order **Common.** The backbone of the dex. Commons spawn constantly across every Region, award smaller XP per catch, and exist to make the moment-to-moment loop feel responsive. A first-week player will catch roughly forty Commons before they see their first Rare. Examples: Trollface, Skull Emoji, Wojak, Sponge Boi Daydream, Snail Gnome, Cone King, Bonk Hammer, Griddy Dog, Touch Grass.

Rare. Roughly one in eight encounters. Rare-tier spawn tables are the first place biome bias shows up clearly — a Greenline walk produces a very different Rare list than a Feed walk. Great Rizz Balls land most Rares; a Standard works on the friendly variants. Examples: Mewing Kid, Buff Pickle, Router Lord, Drake Pointing, Stonks, Stream Hype, Brainrot Baby.

Ultra. Roughly one in forty encounters. The daily chase tier. Strong biome bias, real flee rate, two-or-three-attempt average to land. Ultras are where the catching meta actually lives — most squad-building conversations happen at this rarity. Examples: Skibidi Toilet, Sigma Tabby, Gigachad, Tralalero Tralala, Bombardiro Crocodilo, Only in Ohio, Galaxy Brain, Espresso CEO, CEO Cat.

Mythic. Roughly one in three hundred encounters. The apex of the standard ladder. Master Rizz Balls strongly recommended. A missed throw on a wild Mythic usually ends the encounter — the flee animation is short on purpose. Examples: 6-7, Tung Tung Sahur Lord, Bombardiro XL Crocodilo, Cosmic Such Pup, La Mucca Saturnella.

Limited Edition. Roughly one in one thousand encounters. Event-only or unscheduled ultra-rare drops. Five-minute despawn timer from the moment they appear on your map. Every Limited carries a permanent +5% XP-gain passive on your account when caught. Examples: Cosmic 6-7, Seraph Skibidi, Neon Tralalero, Holographic Gigachad, Prism Cat, Rainbow Streak Kitty, Holo Dragonini.

How the roster connects Three throughlines hold the dex together. First, the Italian Brainrot wave — Tralalero, Bombardiro, Ballerina, Tung Tung, Lirili, Chimpanzini, the Bombardini line, the Trictrac/Trulimero/Udin trio. Second, the Sigma/Mogger cluster — Sigma Tabby, Sigma Wolf, Sigma Pepe, Mogger, the Rizzler, Mewing Kid. Third, the Cursed/Quiet-Hours cluster — Only in Ohio, Skull Emoji, Sus King, Wojak. The remaining Rotmons sit in adjacent thematic neighbourhoods but do not belong to a single cluster.

Reading the rest of the encyclopedia Individual Rotmon pages now carry full origin notes, behavioural profiles, habitat guides, catch strategy and collector outlook. Start with [Sigma Tabby](/rotmons/sigma-cat), [Tralalero Tralala](/rotmons/tralalero) and [Skibidi Toilet](/rotmons/skibidi) — those three entries cover most of the rarity bands and most of the design language.

Keep reading - [Beginner's guide to Brain Rot IRL](/news/beginners-guide-brain-rot-irl) — the longest tutorial we have. - [How spawn rarity actually works](/news/how-spawn-rarity-actually-works) — the algorithm explained. - [Top 10 rarest Rotmons](/news/top-10-rarest-rotmons) — every Limited and Mythic ranked.