This article does not cite any sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.(March 2022)
Extracanonical subject (Unique game aspects not part of story canon)
The U-9 is a creature created in the conceptual stages of Resident Evil 5. The U-9 itself bears a striking resemblance to the Uroboros creatures found in the final build of RE5, due to its composition of worm-like pustules, suggesting that U-9 itself was the basis for the Uroboros. Due to its towering size, it is most likely that the battle with U-9 would have involved mounted artillery, or even the Satellite Laser Device employed against Uroboros Aheri in the final release of RE5.
As seen in the image, U-9 is at least 80 feet tall, perhaps even taller than Uroboros Aheri of the final release; if the U-9 was in the final game, then it would be the tallest creature ever fought in the Resident Evil series.
Fighting this BOW would've likely included at least two stages: one where the monster is hunched over, and one where it stands upright. It was apparently going to be possible to blast the monster's head completely off; what this would've done is unknown.
U-9 1st form - weakened; note the thinner build & the protrusions on its back
U-9 1st form - decapitated, note the flesh in the neck area
U-9 2nd form - standing tall; note how the aforementioned protrusions have now become full-blown arms