What are your favorite light novels?

Like the title says, what are the light novels you like?

Here are mine:

Sword Art Online  , Sword Art Online: Progressive  , 86: Eighty Six  , Youkoso Jitsuryoku Shijou Shugi no Kyoushitsu e  ,Seishun Buta Yarou Series  , Utsuro no Hako to Zero no Maria  

Ai no Kusabi

Kyou Kara Maou