Arias Fernandez a.k.a. Joker a.k.a. Killa Grichka is a dancer, acrobat, choreographer, and artistic director from Madrid (Spain). As a child, he trained in acrobatic gymnastics, practiced parkour, and was involved with various art forms, especially music before he developed an interest for the Krump dance style. He trained as an instructor and choreographer in several urban styles at a national and international level, and also trained in contemporary dance and martial arts. As a teacher and performer, he has worked at and won prizes in various competitions worldwide (Costa Rica, Mexico, Guatemala, Nicaragua, China, USA, Germany, Russia, Belgium, France, and more). Arias has performed with Cirque du Soleil, DNA, L’Anima, D-Block, Cie. Grichka Caruge, Cie. Drixx and Cia. Nadine Gerspacher. His own work as choreographer and dancer includes Aina & Arias, Bioshock, Efil, The Jokerz Company, and Re. His own project, Om Rasa, is a training method based on a variety of disciplines. Arias is currently a member of two of the most impactful Krump crews, Madrootz and Titans. He also organizes one of the biggest freestyle events in Spain (Be Your Beast).