Sylphrena

Syl is a character from the series The Stormlight Archive. At first, Kaladin believes her to be a windspren, but she later reveals that she is actually an honorspren bound to Kaladin, providing him with his Surgebinding powers.

"I bind things, Kaladin. I am honorspren. Spirit of oaths. Of promises. And of nobility."

-"The Way of Kings", Page 913 (hardcover), Chapter 67: "Words"