Daniel Küblböck

Shortly before the disappearance, Küblböck was reported to have privately expressed a desire to assume a female identity with the name Lana Kaiser.

Küblböck rose to stardom in late 2002 when he participated in the first season of German talent show Deutschland sucht den Superstar (DSDS). He gained the most viewer votes in three of the nine rounds of the competition and received the second-most votes in a further three rounds. Together with other participants, Daniel recorded the album United which included the number 1 single "We Have a Dream". He finished the season in third place overall. After DSDS, Küblböck signed a contract with BMG. In March 2003, he released his debut solo single, "You Drive Me Crazy", which topped the German sales chart. The follow-up single, "Heartbeat", and Daniel's debut album Positive Energie both reached no. 2 in Germany and achieved major success in Austria and Switzerland. In September 2003, he launched a perfume line for children in three fragrances under his name. He also released an autobiography Ich lebe meine Töne. Küblböck invested the proceeds from his album Positive Energie amounting to around one million euros in a solar plant in Lower Bavaria, which would bring him high monthly profits. In early 2004, he participated in Ich bin ein Star – Holt mich hier raus!, the German version of I'm a Celebrity...Get Me Out of Here!, where he came third. He then released a cover of "The Lion Sleeps Tonight" which reached the top 10 in Germany and the top 40 on the Austrian and Swiss charts. His next single, the ballad "Teenage Tears", sold 10,000 copies. In August, Küblböck's biographical musical film Daniel – Der Zauberer was released, in which he played a fictionalized version of himself. The film was critically panned and bombed at the box office. At the end of 2004, he released the charity single "Don't Close Your Eyes" with three others DSDS participants under the moniker 4 United, in support of Ärzte ohne Grenzen (Doctors Without Borders). It was a moderate chart success. In 2005, Küblböck launched his own marketing company Positive Energie. In November 2005, he released his second album, Liebe Nation, recorded in German. It only reached no. 54 in Germany, and the accompanying single "König von Deutschland" was a moderate chart success. The next single, country-inspired "Born in Bavaria", was his last ever to chart. Küblböck's subsequent albums were released independently. 2009 saw the release of the jazz album Jazz Meets Blues... Wenn zwei sich verlieben and his first Christmas CD Leise rieselt der Schnee. The following year, he released Schrebergarten and a two-disc compilation Best of 2003–2010. None of these albums managed to enter any sales charts. In 2011, he started hosting his own talk show Daniels Bistro. In 2012, he released the album Diez años Kúblbóck – Ich versteh’ nur Spanisch which included some material recorded in Spanish and influenced by Latin pop. As Daniel Kaiser he submitted the song "Be a Man" to the German national pre-selection for the 2014 Eurovision Song Contest, but it was rejected by the jury. In spring 2015, he took part in the eighth season of the German dance show Let's Dance, where he finished sixth, together with his dancing partner Otlile Mabuse. In early 2016, he released his final album, Jesus Is My Lover.

Küblböck's parents were Günther, a German, and Bianca, a woman of Italian descent. He had four brothers: Andreas, Michael, Günther and Dennis, and one sister, Jasmin. While living in Mallorca, he met and befriended German millionaire Kerstin Elisabeth Kaiser who would later officially adopt him. Daniel subsequently adopted the double-barrelled surname Kaiser-Küblböck.

In 2010, Küblböck came out as gay, after previously describing himself as bisexual. After his disappearance, it was reported that Küblböck had privately discussed wanting to live out a female identity under the name "Lana Kaiser". Another passenger on the ship said in September 2018 that Küblböck had privately described a plan to have gender reassignment surgery to become a woman and had said that he had begun hormone therapy. Shortly before the disappearance, Küblböck created an Instagram account with the name "Rosa Luxemburg", on which he described himself as "transsexual". In 2020, artist Philipp Gufler created a 13-minute short film and a magazine about Lana Kaiser. The film was shown, among others, at the 67th Short Film Festival in Oberhausen and in the group exhibition Sweat in the Haus der Kunst, Munich.

On 24 February 2004, Küblböck was injured when he collided with a truck while driving a car without a licence near Pfarrkirchen. He was fined €25,000 and sentenced to eight hours of community service.

Küblböck was a private passenger on the cruise ship AIDAluna that left Hamburg on 29 August 2018, bound for New York City. At around 5 a.m. (local time) on 9 September, he jumped overboard. The vessel was in open waters about 185 km north of St. John's in the Labrador Sea. The water temperature was about 10.5 °C (50.9 °F). The Canadian Coast Guard launched a search operation, assisted by the cruise ships AIDAluna and MS Zuiderdam. On 10 September, the search was abandoned, because the maximum survival time in cold water was exceeded. Under German law, a person missing at sea can be declared dead after six months have elapsed and a motion is filed by an eligible party. In August 2020, an application was submitted to declare Küblböck dead or to present evidence by 30 September 2020 that he is alive. On 10 March 2021, the Amtsgericht (district court) Passau declared Küblböck dead, setting his death date as 9 September 2018, 8:55 a.m. local time. In the weeks leading up to the disappearance, Küblböck's friends noticed changes in his personality and signs of psychological problems, unsuccessfully trying to dissuade him from going on the cruise. Other passengers on the ship also reported Daniel's erratic behaviour, mood swings, and psychological problems.

2008: Zero to Sexy – Live 2011: Schrebergarten – Live 2012: El tiempo – Live 2013: Diez años Kúblbóck – Ich versteh' nur Spanisch – Live 2014: Die Küblböck Live Show

2004: Live on PE Tour 2003 2004: My Life Is Magic 2007: Jazz Night 2008: Back to the Roots 2009: Jazz Meets Blues... Wenn zwei sich verlieben 2011: Schrebergarten Berlin 2013: Diez años Kúblbóck – Ich versteh' nur Spanisch – Live in Berlin