He started modeling at the age of 15. The Fragile, Toni & Guy, Paul Smith, Jury Black, Blablahospital, tenuto by kawano, and True Religion. In the spring of 2013, he was chosen as the face of a campaign for Gintoki Accessory Stores.
According to Serafini, there is also a Hope Jewelry Project, a collaboration with Soho Hearts.
Upon leaving Japan, he spent a week in Los Angeles hosting relief fundraisers alongside journalist and fashion blogger Louisiana Carmina, with whom he also contributed to Los Angeles Weekly. Later in 2011, he designed a ring in collaboration with Strange Freak s, which was featured in Accestyle.
The music video for his solo debut single "Fallen" (released on November 7, 2014 and hitting the #1 spot on the iTunes popular German chart on its first day of pre-order) features cameo appearances by Japanese artists including Aoi from the band Shazna, Yukimi (former member of Unite), shironuri artist minori and hyperrealistic body painter Hikaru Cho. Seba was also a member of Italian visual rock band DNR (Dreams Not Reality), playing keyboard and performing vocals.