(Unique game aspects not part of story canon)
U-11 was a creature planned for Resident Evil 5 that ultimately failed to make the cut. It appears to have been designed as an Uroboros-based boss. At one point in its development, it was to be fought on top of a moving train. In earlier concepts for Resident Evil 5, it was supposed to be Irving, who was originally an experiment on by Tricell and would have mutated.