Hocotatian
Hocotatians are apparently the dominant race of the planet Hocotate. They are referred to as "Hocotatians" in The Ship's announcement of the Massive Receptacle Series. They are about the size of a nickel (~2cm, ~0.7in), and appear to be more advanced than humans, and having superior, or at least equal intelligence. They are capable of efficient extraterrestrial exploration and interaction, and use devices far beyond the current technology of humans. Their primary means of communication is speech, and they are able to read and write.
Anatomy
They bear multiple resemblances to humans, including expressing human-like emotions; physically, Hocotatians have a humanoid shape, the main difference being a larger head-to-body ratio. Their eyes also seem to be either constantly closed, occasionally popping out. This can be seen in a cutscene in Pikmin 2, and every time Olimar is hit in Super Smash Bros. Brawl.
However, their respiratory system works in an opposite or at least different way from regular humans. While oxygen is one of the keys to human survival, it's incredibly toxic to the Hocotations. Unfortunately, the Planet of the Pikmin's atmosphere is composed mostly of oxygen.
From what can be seen during the game, all Hocotatians have large, round noses and black, slitted eyes. When the pupils of the eyes contract, the iris of the eye can be seen, and iris color varies between Hocotatians; Louie is seen to have orange or brown irises while Mrs. Olimar has violet or purple irises.
Life Style
Hocotatians are a commercialized civilization, their currency being the Poko; commercial service and office exist in Hocotatian culture as well, with references to loan companies. The species has similar family structures to modern day western cultures: that is, husband, wife, children (normally a daughter and a son), and even pets.
Psychology
Hocotatians have the ability to convey a wide range of emotion; in Olimar's Voyage Log, it can be seen that he becomes irritated with his wife, frightened after having a nightmare about Pikpik carrot soup, guilty upon a Pikmin extinction, and joyous upon completing the repairs of his ship.
Hocotatians also differ in personality traits as seen by Mrs. Olimar's somewhat materialistic personality when compared to Olimar's love for music, science, and art. Olimar also describes his boss as greedy and despicable, while Louie, in contrast, is described as quiet and brooding.