Indra is one of the Eight Guardian Generals serving the Emperor, and the incarnation of Mizar.
She is currently the Emperor's personal bodyguard, but before that she was once a great dragon hunter.
After a fierce battle, she managed to defeat Yinglong King, and fused its dragonheart with her weapon, Bazrah. From then on, she acquired the power to control lightning to become known as the God of Thunder.
She has heavy personality like a man, but is also known to never act in a way that would hurt the Emperor's dignity.