Well most otakus loves a badass character and there are many of these characters here in the anime. So have you already watched it?? If you have who is you're favorite??
haven't watched the latest season yet, but love it! As for my favorite, that's tough! I love Shizuo and Izaya (though that's more of a love-hate thing...), but I think I gotta give a shout out to Kyohei Kadota/Dotachin!