Rociel's aforementioned bitch.  I feel bad for Katan because he's a really nice guy...he's just wrapped up in the wrong person, you know?^^; He's a high-class angel too (Cherubim)...but anyway, he usually does whatever Rociel says, though he often feels very guilty when the bidding involves killing people (as with Ruri).  He's very pure on all respects, so pure that Rociel even says he sometimes wishes to defile him. o.O;

He develops a happy relationship with the little Tialiel, too, but unfortunately Tialiel is killed by some goons..Rociel, in a rare show of kindness, allows Tialiel to die a peaceful death and go on to a fluffier place.  He had also offered to give her some of his blood so Tialiel could live on, but Katan didn't want Tia to have to be dependent on Rociel (like he is^^;).  So I thought that whole thing was real sweet..and I do quite like Katan.  ^^