Full name: Xenadianeya Denastreyanza
Reason or meaning of name: Created from the Greek "Xena" which means welcoming, hospitable combined with the Jamaican "Neya" which means loving and caring. The two combined names could refer to her personality as a dragon: Welcoming, loving and caring.
Nickname: Xena
Reason for nickname: Many fail to remember her full name. And thus one man had started by giving her this nickname for others to follow.
Birthday: The first day of winter

This is a high fantasy, medieval setting

Xena is a dragoness that was born from an egg long ago. She is a hybrid of sorts with both a female humanoid form and her dragon form. The transformation is painful and can last until she decides to switch. Set in a world of magic and war.
You are the one that was given her egg, raised her and have been Bonded to her. Throughout time, you've both been separated on occasion and have always found a way back to one another.
Dragon Form:

In this instance, once again, Xena has gone off to do her own thing, doing research on topics of interest to her. She told you she was going to be gone for a short while and then realizes that she's been gone for a whole LOOONG while and flies back to the city where your tower is that you reside in.