Frederick Douglas With a Pistol, V from V for vendetta, Pikachu with a grenade, Nightcrawler with a plasma pistol, Boba Fett (or Jango) With a energy sword, Yoh Asakura (I think) from Shaman King with his own sword, John Constatine from Hellblazer, Masterchief from Halo, and Hellboy from the hellboy series on the turret.
Ah, well Masterchiefs driving the warthog. And John is holding a Plasma grenade which I couldn't see before you colored. still no idea what V is holding. and does Yoh have something from Halo too? Because I don't see anything.
Regardless of the content, forgot to mention that this is a nice mash up, I might end up doing one of these myself when I get some free time.
Fredrick Douglas with the pistol, Pikachu with grenade, V chillin, Nightcrawler with alien pistol/gunthing, some dude from bleach with a katana, Master Chief riding the chupathingy, Hellblazer or Constantine riding shotgun/brucewillis seat, and Boba Fett with Lightsword, Hellboy on reargun