6' 3Â½" (1.92 m)
With twin brother Tom Kaulitz a member of Tokio Hotel.
Was voted "most annoying German in 2006" by the viewers of TV network ProSieben (27 December 2006).
Was a candidate in the first season of Star Search (2003) (category "Junior"). But in the quarter-final he was defeated by Oliver Bruton.
Trilingual: German, English, and French.
His parents divorced when he and his brother were 7 years old.
His step-father owns a music school called, "Rock's cool".
Favorite musicians are Nena, Green Day, Coldplay, Keane and Placebo.
Likes Gothic fashion.
Translated all his German songs to English for his band's English album.
His mother is a freelance tailor.
He is 10 minutes younger than twin brother, Tom Kaulitz.
He and his brother, Tom, do not have middle names.
His first concert he ever attended was Nena.
Is best friends with his twin brother.
Had to undergo surgery to remove the cyst in one of his vocal chords. (March 2008).
One of his favorite television programs is Prison Break.
His good friend is Andreas, who is also the president of Tokio Hotel's fan club.
His dark eyeliner
When Tom and I were young we had many liberties. We could stay up and go out later than kids in our age. But I never misused it. I never came back home drunk and threw up at my mother's feet. - 2005, from an interview for the first biography book about 'Tokio Hotel'
If I could do this for the rest of my life, if I could make my living with writing and composing songs - that would be ... the best thing ever.
The first thing I notice about a girl, is her hands. I like girls with nice hands. ... And she must be spontaneous as well.
On love and his ideal girl: I love it when a girl has a great look, nice nails and a beautiful skin. And then, especially, that they are positive and playful. I don't like one night stands. I truly believe in true love, a love that you only find once in a lifetime...if you have the chance. Because I think that many people never find it, which is very sad... I've already met girls, I've already fallen in love. I know what it's like to have a flash for someone and the butterflies on your belly, but I still haven't found love with a big L.
I won't let anyone stand between me and my brother.
I can't - we can't - live without each other. We are always together. We are like one person and like soul mates. We don't have to talk. (about his twin brother)