As you can guess, Aka Kenshin is the reincarnation of Kenshin Himura. But unlike his former self, Aka Kenshin is an antihero. He is cold, ruthless, and a lone wolf to boot. The angel was alone until he ran into the young reincarnation of Kaoru Kamiya. Now she follows him around and Aka Kenshin gets his energy from her by sleeping with her. Later, the angel develops feelings for both Kaoru and Brass. He is known as the "Angel Killer". Kenshin's powers are fire and ice.
Kaoru, as I said, is the reincarnation of Kaoru Kamiya. When she first met Kenshin, it was love at first sight. Soon, the girl grew obsessed with him. So obsessed, that Kaoru ran away from home to be with him. Kenshin doesn't give a crap about her but he finds her real "useful." But Kaoru doesn't care, just as long as she's with Aka Kenshin. But she is in danger. Other angels are hunting her down and planning to kill her for fallen angels want to use her for power.
Deep Throat is one of Aka Kenshin's former allies. He is part of the group of fallen angels called the Rat Pack. Deep Throat is the spy of the group. He is after Kaoru for the same reason Kenshin wants her. Deep Throat is on heaven's most wanted list along with the rest of the Rat Pack. His powers are fire.
Doc is another one of Aka Kenshin's former allies. He is the leader of the Rat Pack. Doc and Kenshin were once really close. But then Kenshin grew powerful. So powerful, then the angels in heaven wanted to recruit him. Afraid of betrayal of his friend, Doc called up the three Rats and plotted a conspiracy against Kenshin. Now, Kenshin wants to kill Doc and the Rat Pack as revenge. Doc is also after Kaoru for the some reason. His powers are lighting.
Ozzy is another one of Aka Kenshin's former allies. He is also part of the Rat Pack. Ozzy is the messenger of the group. He too is after Kaoru for the same reason. Ozzy is second in command in the Rat Pack. He helped conspiracy against the disposal of Aka Kenshin. His powers are water.
Brass is yet another one of Aka Kenshin's former allies. He is the weakest of the Rat Pack. On the surface, Brass hates Kenshin. But inside, he is in love with the aka angel. Why? Maybe it's because he is half pure. Or maybe it's the fact he is the weakest. Either way, Brass must keep these feelings secret. Kenshin knows his feelings and plans to use them to his advantage. Brass later has feelings for Kaoru as much as Kenshin. So he tries to help them escape. Brass's powers are nature.
Boss is the strong biker angel who owns the concubines. He secretly lusts after Kaoru. But the angel must keep it a secret or he will lose his job. Boss and Doc were once good friends until Doc fell. Then they become bitter enemies. Boss would kill for anything to have Aka Kenshin's blood on his sword.
The concubines are servants of heaven. They have only one mission: Kill Kaoru. Why? She is a threat to heaven and earth. So the concubines will stop at nothing to destroy Kaoru to save everyone. But it's not easy. Kenshin and the Rat Pack will fight back in order to save their precious source of energy. There are as many as 25,000 concubines.
Ami is Kaoru's best friend. She is worried about Kaoru and Aka Kenshin. Ami sees the angel as a threat to Kaoru. So she tries to keep her away from him at all costs. The girl even gets the concubines tips on where Kenshin and Kaoru are. Ami is a shy girl. Later, she falls for Brass but is rejected by him lightly.
Kiki is Kaoru's other friend. She too worries about Kaoru and gives tips to the concubines. Kiki and Kaoru have known each other since elementary. Unlike Ami, Kiki is blunt and a little wild. She has many cousins that live with her. Kiki falls for Boss and helps him with the concubines.
Rikako is the senior girl who's been bullying around since she first started high school. She calls Kaoru cruel names, steals her things, and tries to get her in trouble. Rikako is a narcissist and thinks she's better than everyone else. But one day, while bullying Kaoru around like she normally did, she met a tragic end.