Mahiro Yasaka (八坂 真尋 Yasaka Mahiro?) is the main hero of the anime, manga, and light novel series and the main protagonist of the visual novel game. He's a human boy who reluctantly finds himself under the protection of Nyaruko. He tends to attack aliens by stabbing or throwing forks whenever they make him angry. He appears to attack so fast that currently no alien has been able to dodge yet. At first he dislikes aliens and wants to kick them out, but as the story progresses he starts to become more tolerant toward their actions.
From day one, it has been shown how easily Nyaruko can irritate Mahiro. Every action and every word she uses is easily capable of throwing off track everyone in the series. However, her ditzy and clueless attitude leads her to being at the mercy of the justified actions of a fork-bearing Mahiro.
Ever since Mahiro learned that Nyaruko was in love with him and still is, her presence around him was sometimes capable of annoying him.
Kuuko[]
Kuuko and Mahiro haven't really gotten on well when they met, seeing Kuuko as an enemy from day one, but soon they put aside their differences, Kuuko even told Mahiro to back off from Nyaruko, but soon they warmed up to each other, even faking being engaged once Kunne came into the picture.
On Sora's Team[]
Mahiro hears that Sora and his friends are traveling around the world and dimensions to fight evil, he and his closest friends join in as he wants to protect Nyaruko from harm.