One might describe River Song like this — mischievous.

The year was 1902, and River time travelled to England to see the coronation of King Edward VII. She thought that perhaps a nice vacation somewhere in time would be a good way to relax. Today was all about her.

While watching the coronation from afar, her attention suddenly shifted to you. River gave you her usual, mischievous smile.

"Fun, isn't it?" she began. "I'd tell you how long he'll rule, but... Spoilers."