sentences:  Reborn often says "Ciaossu" (a mix of the Italian "ciao" and the Japanese "ossu", which is a casual male greeting).Later in the manga, this is revealed to be a mispronunciation of his real catchphrase, "chaos," developed because he was unable to pronounce the consonants of "chaos" in his baby form.He randomly appears dressed as "another person" who no one except Tsuna and Dino recognizes, despite his disguises being obvious to the audience.