The 27-year-old German man is suspected of storming a synagogue in Halle on Wednesday and shooting a female passerby, before attacking a nearby Turkish kebab shop where a man died.
Balliet broadcast a live video of the attack on the Twitch streaming platform and published an antisemitic and racist “manifesto” online, echoing the Christchurch terrorist and other recent far-right attackers.
He repeatedly called himself a “loser” in the footage for failing to break into the synagogue or kill more people, after his homemade gun repeatedly jammed.
The livestream stopped after Balliet dumped the helmet-mounted camera and his car while fleeing Halle, before hijacking a taxi and being arrested following a crash around 10 miles south of the city.
A source told Reuters that Balliet had done military service, which was compulsory in Germany at the time, but received no special training.
Balliet’s livestream and online documents seen by The Independent suggest he was deeply embedded in online forums, gaming culture and had a fascination with Japan.
He called himself a “weeb”, denoting an obsession with Japanese culture, and an “anon” – the term used to describe users of 4chan, 8chan and other imageboards that were used by previous mass shooters to share manifestos.
One of three documents Balliet posted online before the attack was entitled “manifesto” in Japanese and included an image of a sexualised anime “cat-girl”.
The tongue-in-cheek message said that readers could get a free cat-girl or “waifu” if they “kill at least one Jew”.
The document, written in English, called for “discontent white men” to murder Jews, non-whites, communists and “traitors”.
The document said he aimed to inspire attacks by “other suppressed whites” by livestreaming his attack, kill as many “anti-whites” as possible, and that he would wear protective clothing and aimed not to die.
It included a score sheet of “achievements” for the attack, including numbers of kills and methods, but few were met.
The documents appear to have been originally posed on the Kohlchan website, which is a predominantly German-language “chan” imageboard whose name translates as “cabbage chan” or “nonsense chan”.
Balliet said he had “originally planned to storm a mosque or an antifa ‘culture’ centre” which he thought would be less secure than the synagogue targeted.
But he claimed his ultimate target was Jews, after declaring his belief in conspiracies including the “Zionist-occupied government” theory.
Speaking in English at the start of his livestream, Balliet said he was a Holocaust denier and said he believed feminism was ”the cause of declining birth rates in the west”.