Quick answer

Coo is the default name of the Divine Dragon, the dragon girl you raise in DRAPLINE. Her name is chosen at the start of a run and can be anything you like; Coo — クー in Japanese — is the name the descriptions and trailers use when they need one.

The official store page almost always calls her “the Divine Dragon”. It describes a being that is just born, eats anything, and turns food into power, and it confirms that how you raise her changes both her appearance and her personality.

Who Coo is

The premise is compact: the world faces a catastrophe in one year, and the way to meet it is to raise a dragon girl known as the Divine Dragon. She appears in the village, and the player — a separate character — takes her in and feeds her.

Her appetite is the game’s central engine. The store description lists meat, fish, rocks, iron and lava as ordinary fare, then adds mountains and other people’s houses. What she eats becomes her strength, which is why food choices double as build choices.

DRAPLINE opening scene showing Coo the dragon girl meeting the player in a dark cave
The opening encounter from the official store screenshots, where the player meets Coo and names her.Steam store screenshot

The name: changeable, with Coo as the default

You set the dragon’s name at the beginning of a run. Community sources record two spellings of the same default — “Coo” in English material and “Kuu” in Korean transcription, with the Japanese original written クー. The English wiki traces the name to the Japanese verb 食う (kuu), “to eat”, which fits a character whose defining trait is appetite.

One naming rule circulates that is not documented anywhere official: after completing a run by defeating Ouroboros, the name used in that run is reportedly unavailable in the next run. Only one community wiki records it, so treat it as an unverified quirk rather than a rule you can plan around.

How she grows: food and weeks, not XP

DRAPLINE has no experience points and no character levels. Growth comes from feeding and from weekly actions: the game runs in weeks, and each action you choose spends one. Resting at home spends the week to recover energy — the Japanese wiki records a 60-point recovery for that action.

Coo also works with the townsfolk, which pays back in Skill Inspirations, items and gold. That matters because skills are the second growth axis: what she eats raises her stats, and what she learns decides which of those stats turns into damage, defence or utility.

The six attributes used by feeding and skills (community wikis, consistent across sources)
AttributeRole in the build
HPHealth pool; the six-digit achievement tracks reaching S rank here.
STRPhysical damage.
VITDurability.
INTMagic damage; a heavy-INT upbringing is one documented route to specific Auras.
RESResistance.
AGISpeed and turn order; some skills scale their damage from it.

Appearance and Aura change with raising

The store page promises that appearance and personality change over time depending on how the dragon is raised, and the Japanese wiki puts a date on one of those changes: the Aura shifts in the first week of October, calculated from the upbringing so far. That same page describes the Aura as appearance only, with no effect on stats.

Official achievements list six Aura states — Adored, Chill, Mischievous, Reserved, Whimsical and Steady — with unlock rates that range from 62.3% for Adored down to 26.0% for Whimsical. Older wikis still list four, because Whimsical and Steady were added later. Personality is a separate system from the Aura; the personality page covers that split.

DRAPLINE story scene with Coo eating beside another character at a table
A story scene from the official store screenshots. Food is the game’s growth system as well as its running joke.Steam store screenshot

What the sources leave open

Three details are worth flagging before you rely on them. The wiki notes that Coo seems able to hide her claws and wings at will, and admits the game never addresses it. Her age and species have no official text — “just born” is the store page’s phrasing. And because 1.0.0 reworked the English and Simplified Chinese translations, named prompts and dialogue wording may differ from older guides.

What the sources do agree on is more useful: the name is yours to choose, Coo is only the default, and everything about her — stats, skills, Aura, endings — grows out of what you feed her and how you spend the year.

Sources

Official store text was checked on 29 September 2026. Community wikis are named with their update dates where available.

Page added 29 September 2026. Source check performed 29 September 2026.