Tharja is cold and moody around other people, especially when they interfere with her attempts to gain Robin's attention. Even when being courted by other members of the Shepherds, she makes it very clear that Robin remains very near and dear to her. As such, should she come across anyone other than Robin, her attitude shall be standoffish and aloof. Think Tsundere. If you're not her precious Robin, forget about her being warm. She'll try and hex you.
Tharja comes from a very long line of shamans and sorcerers, and has been learning the dark arts since a very young age. Her spells can have both positive and negative effects on the target. For example she can hex someone to either cure or cause a disease. She can communicate with the dead as well. Something fun to note.
She enjoys hexing and experimenting. Do not try to have her do anything strenuous. She's a mage, not a knight. She'll curse you if you make her sweat~
