Yashiro Chikama

Yashiro Chikama is a friend of Akira Hino, whom she met while they were fishing. Like Hino, Chikama makes their own sound effects, the most notable being the "breathing" sound for their spacesuit. In their introduction, they explain that they have come to Earth to find their brethren.

(Source: Adachi to Shimamura Wiki)