Usually because I wish to learn もっと見る about them if they manage to draw my attention just like with every type of Character. Imagining the possibilities they can または could bring on the 表, テーブル in the meantime is also a nice pastime. And there are also the times I can respect または even relate to some of their reasons for keeping the Mystery to them like the fact that being an entirely open book in the past didn't do me as much good when dealing with certain people !!!!
