Subaru Imai
His name “Subaru” means ‘Pleiades’.
It was shown in volume 12 of the manga that Subaru and Shūichi knew Mikan’s father and mother, Yuka Azumi, when they were young. The two of them seem to care very much for Mikan, and protects her from those who are after her. In a special chapter about Shūichi and himself, he disliked Shūichi for saying hurtful things and thought that he is arrogant because he has 3 Alices. It also shows that he really likes Yuka.