Reincarnation of: Shukaido.

Haruhiko, unlike Sakura and Daisuke, does not see the advertisement in Boo! magazine. Rin runs into him in a uniform store and realizes who he is. Haruhiko is racked with guilt over the terrible thing he did to Shion in his previous life. As such he does everything that Rin tells him, including claiming that he is the reincarnation of Shion. This turns out to be an inspired move. Between Rin's machinations and the their piecing together of their moon memories, the other reincarnates begin to fear Haruhiko and what he may be doing to them, even though Haruhiko has not actually done a single thing to any of them. Haruhiko has a very weak heart, due to his excessive use of his ESP when he was younger. Haruhiko resembles Shion physically, because Shukaido was obsessed with him when he died. This explained when Haruhiko mentions that his mother is half Indian (making Haruhiko 3/4 Japanese and 1/4 Indian).

Source: Wikipedia.