Koppai

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Koppai and its moon.

Koppai is the planet Alph,Brittany and Charlie are from. The story of Pikmin 3 revolves around the fact that the food supplies have begun to run out on their planet due to extreme population growth, and the brave astronauts leave in search of the needed food supplies.

Geography

Koppai is a relatively small planet, especially in comparison to PNF-404, and is orbited by an even smaller moon, which orbits very closely to it. Koppai's surface is never seen or described in-game, but the opening cutscene seems to imply that the planet has a very thick atmosphere, covered in large masses of clouds.

According to Brittany, the gravity on Koppai is roughly ten times stronger than on PNF-404, and the oxygen levels are about three times higher on PNF-404.

Koppai and Hocotate are two very close planets, which suggests that they could even be in the same solar system.

Another interesting feature about the planet is that it rotates on a tilted, vertical axis much like Earth does. Strangely, its moon revolves around the planet vertically.

Life

The only known lifeform indigenous to Koppai is the Koppaite, a sentient species similar to the Hocotatians. Due to the fact that Koppai exhausted their food supply by the events of Pikmin 3, it seems that most, if not all, other life on Koppai is extinct. Alph also mentions that the entire Koppaite population usually just migrates when they deplete the resources of their previous planet, so it is possible that Koppai was just a barren planet until the Koppaites arrived and named it.

Government

It seems that Pokos are a universal currency in the Pikmin universe, as Koppai also uses them. 

Due to the fact that Koppaites have it "written into their DNA to never stop eating and never stop to plan", it can be assumed that they have a very weak government, or one that may be consumed by Anarchy. However, Brittany mention elections when speaking to Alph, meaning there must be some sort of president or mayor on Koppai.

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The 3 captains from Koppai.

Trivia

• Koppai's name is derived from Nintendo's original name, "Nintendo Koppai."
• The distance between Koppai and PNF-404 is 279,000 Lightyears.
• Originally, HTML on the Pikmin 3 Japanese website could be decoded to reveal a line of text, "Brittany, botanist on behalf of Coppa Lee Star", whereas Alph and Charlie were both listed as "on behalf of Koppai Star". Because "star" can translate to any celestial body, many assumed this meant Brittanty was in fact from Koppai's moon, which was thought to be called "Coppa Lee/Koppali". However, it was later discovered to be a mistranslation.
• Koppaites seem to speak the same language as Hocotations as seen in Pikmin 3.