A Hastur (alien species), who attended the same space kindergarden and space elementary school with Nyaruko and Chtuko. Despite Hastur's appearance, Hastur is actually a boy. Nyaruko and Cthuko call him "Hasuta-kun". He possess the power of air, and is known to be stronger than both Nyaruko and Cthuko, since he was the one who always stopped their fight during space elementary school.
Hastur is based on both on Hastur "The Enigma", as well as Ithaqua The deity of the wind. Both are from The Cthulhu Mythos.
In season 1 episode 5, he says to Mahiro that he loves him and when Mahiro says that they are both boys, Hasuta replies by saying the one he fell in love just happened to be a boy. Mahiro somehow dodges his confession by saying that the world is 25 million year cycle and the same thing occurs again after 25 million years, so Mahiro says will accept him as his lover in the next cycle to which Hasuta also agrees. Even after this he is seen to be quite obsessive over Mahiro at times.
Hasuta can transform into an older and stronger version of himself, and it is proven in the 3rd episode of the 2nd season that he is quite scary while in his transformation.