** Spoiler Alert!!! click to hide or show**
-Kazuma Yagami
Kazuma is a former member of the Kannagi household. He was banished from the family by his father after being defeated by Ayano during the successor ceremony for Enraiha, his family's sacred sword, due to his inability to use fire. Four years later, he returns to Japan as a skilled master of wind. You have to watch the anime to find out the rest^^
-Ayano Kannagi
Ayano is a skilled En-Jutsushifire user and the successor to the Kannagi family's head. She is arrogant and irrational, usually taking action by herself even while going against orders. Though she seems undisciplined, she is very proud of her heritage. Despite claiming to hate Kazuma, Ayano develops a crush on him, but is often irritated when he flirts and makes a move on her and is prone to throwing fits of rage when he gets close to another woman. She later comes to realize that she is actually in love with him. Kazuma is also the only person she sees as stronger in power and presence than even her own father.
Ayano's power is the Crimson Flame, Kouen, although she is not yet able to consciously control it. She also holds Enraiha, the Kannagi's sacred sword, which she won by defeating Kazuma at the successor ceremony four years before the start of the story. Ayano tends to fight recklessly and her anger and pride gets the better of her. Kazuma beats her in every encounter and points out the deficiences in her fighting style.
-Ren Kannagi
Kazuma's younger brother. He looks up to Ayano and practically worships Kazuma, stating that one day he hopes to be as strong as him so he can protect everyone. Ren's power is the Golden Flame, said to have the largest purification effect. To find out the rest of his story, go watch Kaze no Stigma