Hasta

A Hastur (alien species), who attended the same space kindergarden and space elementary school with Nyaruko and Chtuko. Despite Hastur's appearence, 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 Hastur: The deity of the wind. Hasuta (Shouen version in season 2) is voiced by Seki Tomokazu.
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.