Here's Diana Lacour as her Spirit form, the Book of Wonderland, Spirit of Informations.

The Book of Wonderland contains all the information since the beginning of our world, and other informations like people's biographies and powers. Diana only has to tell a subject or the name of a person to make the book open to the proper page. Plus it has other utilities :
-If she search for a person, the biography stops at the location of the said person (work like a GPS)
-It can be used as a translator.
-Diana can learn every informations/words/languages she read, allowing her to be a living encyclopedy (she uses it to read books for free) making her the smartest human in the galaxy.
-The Book makes Diana younger, it's a side effects.
-The Book has no offensive/defensive power. But she can materializes words of the books to share the information to the person she wants.
-It has images.

She doesn't have a Queen/King/Maxima form, since this form is said to be the ultimate source of informations.