The manga has been adapted into an anime television series, which was produced by Xebec and was broadcast on Japanese television network TV Tokyo from 2006 to 2007. In December 2007, the anime was announced for North American DVD release by Viz Media. In 2009, the series made its American television debut on the Funimation Channel, with American broadcast rights acquired by Funimation from Viz Media. The series has also spawned two drama CDs, two light novels, a PlayStation 2 video game, and many types of Buso Renkin-themed merchandise.
In Japan, the Buso Renkin manga was adapted into an anime series which ran on TV Tokyo; it was directed by Takao Kato, written by Akatsuki Yamatoya, and produced by Xebec. Buso Renkin aired between October 4, 2006, and March 28, 2007. The episodes were later released by Geneon Universal Entertainment in nine DVD compilations between January 25, 2007, and September 21, 2007. DVD box sets containing all twenty-six episodes were released on November 26, 2009, and on February 27, 2013. Geneon Universal Entertainment released an animation soundtrack CD for Buso Renkin on January 25, 2007.
On December 8, 2007, Viz Media announced the release of the English dub, which would be released in two DVD sets of thirteen episodes each. The first set containing episodes one to thirteen was released on April 29, 2008. The second set containing episodes fourteen to twenty-six was released on October 7, 2008. Funimation launched Buso Renkin on their Funimation Channel on April 27, 2009, marking the series’ American television debut. On December 20, 2009, the first three episodes from the series were officially uploaded to Hulu and Viz Media’s portal. Two episodes were uploaded weekly thereafter; the final episode was uploaded on March 8, 2010. Beginning on October 2, 2012, Buso Renkin was streamed on Neon Alley.
Shueisha released two drama CDs for Buso Renkin. The first CD was released on May 26, 2005, and the second CD was released on October 6, 2006. It also released two “Expert CDs”, which features the radio drama, opening and ending themes and unreleased soundtrack songs. The first CD, Expert CD 1, was released on March 28, 2007. The second CD, Expert CD 2, was released on June 8, 2007.
Two light novels were written by Kaoru Kurosaki, illustrated by Watsuki, and published under the Jump J Books line by Shueisha. The first one, Buso Renkin Double Slash, was published in October 31, 2006, and Buso Renkin Slash Zeta was released on May 25, 2007. A guidebook titled Buso Renkin Infinity was published by Shueisha on May 2, 2007.
Two Nintendo DS fighting games, Jump Super Stars and Jump Ultimate Stars, have featured characters from the series. A PlayStation 2 video game developed and published by Marvelous Entertainment was released on June 28, 2007, under the title Buso Renkin Youkoso Papillon Park e. In Japan, action figures, T-shirts, a trading card game series, key chains, straps, and a variety of other products were sold as merchandise for the series.
- Kazuki Muto
- A 16-year-old boy who was killed by a homunculi when trying to save Tokiko Tsumura. When Tokiko replaces his heart with a buso renkin to revive him, he decides to help in the fight against the homunculi and is later asked to be an Alchemist Warrior by Captain Bravo, which he accepts due to his will to protect his sister Mahiro and his friends. His buso renkin is Sunlight Heart, a spear-lance; it has a cloth that turns into energy which allows to be used as propulsion or as a blinding light.
- Tokiko Tsumura
- A 17-year-old alchemic warrior. Seven year prior the series events, all the people in her school except for her are killed by homunculi, and she is rescued by Mamoru Sakimori. As such, she is serious almost all the time. The incident also left her with a scar, which could have been removed by using alchemy, but she decides to keep it as a reminder of her will to fight. Her buso renkin is Valkyrie Skirt, an execution scythe that attach to her thighs and is controlled via her synapses.
- Koushaku Chouno
- A 19-year-old genius student. He is deathly ill with an unspecified disease, and learns about the process of making homunculi through research notes from his great-great-grandfather, experimenting with various animals first. Later, he turns himself into a human-type homunculus and renames himself Papillon. He kills his all family, but is subsequently killed by Kazuki.He is later revived by L.X.E., and wants to fight Kazuki once more; he is first prevented because he is still ill, and then because Kazuki is being chased by the Re-Extermination Squad. To prevent Kazuki’s death, Papillon re-creates the white kakugane using Alexandra Powered’s research. He and Kazuki finally have their showdown, but in the end he loses to Kazuki, who refuses to kill him again. His buso renkin is Near-Death Happiness , a black gunpowder that can assume any form—it takes the form of butterfly wings as a reflection of his soul—and be detonated remotely.