Tarek named himself "Schwiegersohn" ("son-in-law"), Maxim "Stiefvater" ("step-dad") and Nico "Warmer Bruder" ("warm brother", derogatory for gay man).

In August 2006, they were a supporting act for the Bloodhound Gang on the German leg of their tour, and in early 2007 for Prinz Pi on his !Donnerwetter!

Playing hip-hop at a rock festival was considered to be a huge affront, prompting audience members to throw beer cans onto their stage.

On 20 August 2007, they organized a concert with the motto "Reclaim your U-Bahn" in front of the train station Schlesisches Tor in Berlin Kreuzberg.

Originally, the concert was slated to take place inside a train, but the BVG closed down the entire station and called the police, who appeared in riot gear.

Their album Hahnenkampf ("Cock Fight") was released on 24 August 2007, and distributed with the help of Universal, and was ranked 9th in the German sales charts.

In the video based on their song "Geld essen" ("To Eat Money") one scene shows two homosexual men kissing.

DJ Craft and Nico, two of the band members, additionally performed as a Duo called "Turntable Hools" in all of the concerts of this tour.

In April 2010 K.I.Z started working on their new album Urlaub fürs Gehirn ("Vacation for the Brain"), whose sound aesthetic was supposed to tie in with Hahnenkampf.

On 24 April 2015, K.I.Z announced that they would release their fifth studio album Hurra die Welt geht unter ("Hooray, the Apocalypse is here") on 10 July 2015.

[1] 2017 saw the release of a song called "Glück gehabt" in which the group appears under the pseudonym "Die Schwarzwälder Kirschtorten", containing topics such as sex tourism in Thailand.

The song criticizes the excessive alcohol consumption on the Oktoberfest in Munich and the harassing behaviour of drunk, mainly male, visitors.

It critiques the "ready for war" behaviour of the EU and Germany regarding the Russian invasion of Ukraine, and the support with equipment that is given by the mentioned parties.

Few days later, they removed the announcement from their Instagram stage, and posted a statement in which they confess, that their page was hacked and that there will be no podcast.

They also like to parody other rappers, people or the hip-hop genre itself, as heard on the song "Die kleinen Dinge im Leben" feat.

In September 2018 K.I.Z participated in a concert with other artists and bands in the German city of Chemnitz to make a statement against far-right protests and anti-immigrant violence.

In addition to this, he is also a member of the Berliner soundsystem Body Rock; together with DJs Mad Millian and Philipp, this group puts reggae, hip-hop, and dancehall styles at the forefront of their sound.

In 2012 at a convention for Die Linke he held a discussion with the rapper Sookee regarding depictions of women, sexism, and homophobia in hip-hop.

Earlier in his career, he called himself Euro8000, but because of the artist Euroboy, the guitarist of the Norwegian death-punk band Turbonegro, who wore an SS flat cap, he decided to use his real name to avoid any possible confusion.

Later he and his partner Grzegorz Olszówka, formerly the frontman for the Berlin-based band ArEt, formed the production duo known as Wass Bass.

In 2012 Nico also participated in the fifteenth Splash Festival in Ferropolis near Gräfenhainichen with Kraftklub under the pseudonym "Fledermausmann" (Batman).