The protagonist of the manga, Leroy has super-human speed, strength, and stamina. He is accompanied by his sentient sword, Ragnarok. He is quick-thinking, though sometimes he can be irrational. He despises those who kill for no motive other than profit. He keeps sealed within him an immense power, along with feelings of isolation from other humans because he is a Lycanthrope. The power within him only manifests itself forcefully whenever Leroy sustains critical damage. (Source: Wikipedia)
Rey Yan is the main character of the series. His past is mysterious and full of heartache. He wields the Pasa sword which has a similarly mysterious a past. His true sister disappeared long ago and now he travels with Shyao, a girl he both pictures as his older sister and his one true love, though he's never going to admit it. Rey is hot tempered and hard to reason with, and though his skills are extraordinary, he has a long way to go. His combat skills are raw and heavily dependent on his sword. Inside him is the power of Ban-Go (Pan-Gu), the progenitor god of the universe, and is partly unleashed during the battle with the Sorcerer King, Rey Yan does not have complete control of him. As such he can be defeated by a heavenly god with more control of their powers
Leroy's sentient sword. Ragnarok is cautious and calculating, making him a perfect foil of Leroy. In times of danger, Ragnarok is able to manifest himself in human form. (Source: Wikipedia)
A powerful demon that wields the Soul-Scattering Hammer. Her actual essence is not physical, so she must possess several bodies to be able to use her powers fully. Currently, she inhabits the body of Sorceress Renshou, and Renshou's consciousness is present within her, and is even a part of her. Powerful as she is, she has little defense against techniques that cause her soul to leave her body. Hyacia was born from the dark emotions: Hatred, Bitterness, Pride, Malice, and Cruelty that were left over when Ban-Go was murdered. According to Laobi and Louen, she is the Heavenly Tiger who is attendant to the Empress Mother of the West. Hyacia is quite taken with Rey Yan and does all in her power to help the young man. However, when speaking with Ban-Go about Rey, Hyacia states that she prepared Rey's body, and that of another, to be able to withstand the power of Ban-Go. She even says "I will give Rey everything I hate... until his final moment." Hyacia rules over the demons of the human realm in the place of the Heavenly Realm, and gives the Sorcerers of Human Realm their power. Her control has created much resentment amongst the Demons of the Human Realm. Hyacia has an uneasy past with Sword Sage Shouren. Despite her connections with the Heavenly Realm, Hyacia has some distaste for the Sages that watch over the human realm. She also seems to oppose Prime Minister Shiyan's plans for Rey. What her ultimate goal is has yet to be revealed, but it known that has something to do with the death of the Heavenly Gods and the Demon Emperor.
Tsurugi, the red Sword Eyes of Light, was taken away from his home land after riots. Sent there as well was his protector, a droid called Bringer, and one of the 12 Sword Braves. He lived there with an elderly couple, not knowing the origins of his birth or about his older brother, Yaiba. He has a talent for skateboarding and dreamed about being a pro. When he was attacked by a white droid, Stinger, Bringer awakened and gave him a deck to battle with. Bringer instructed him on how to play as he wasn't aware of the rules. After the battle, Bringer revealed to Tsurugi the truth about his past, and showed him a hologram of his mother. Tsurugi's village was attacked by Cornell, a member of the green army of the Sword Eyes of Darkness. He was forced to battle again, to save his grandmother, but was able to win. Tsurugi's grandparents encouraged him to look for his real mother. He soon met Vargas, who was in the form of a white light. Vargas offered the red Sword Brave of Darkness to Tsurugi. He accepted it, because he needed the power and because he throught using the darkness might help him understand Yaiba. Then, he became the red Sword Eyes of Darkness. Tsurugi battled Vargas with a new deck which he obtained soon after, and defeated him. It was said that Tsurugi was the first ever case of a Sword Eyes of both Light and Darkness. (Source: Battle Spirits Wikia)