He was voiced by famous comedian/actor David Alan Grier.
Red is a ginger and white colored cat with green eyes, a pink nose and ginger stripes.
Role in the film
He was first seen when he asks Stuart Little where he's going and called him Murray, and was chasing him in the roaster alongside Smokey and Lucky but they failed to get Stuart as he was going back to his home.
He was later seen again with Monty, Lucky, Smokey and the Unnamed Gray Cat and was seeing Stuart and Snowbell and then when Snowbell was almost breaking the branch he was standing with Lucky, Monty and the Unnamed Gray Cat and then the branch broke and all 4 of them were screaming and were defeated by falling into the water and Red was saying he rather drowns and escapes from the water with Lucky, Monty and theUnnamed Gray Cat got defeated.
After they got defeated, Red, Lucky and the Unnamed Gray Cat were never seen again in the rest of franchise but Monty was.
Like the other alley cats, Red is snarky and evil. The only difference between Red and the other alley cats (especially Smokey) is that Red is a delta and lacks the intelligence of the others, as evidenced by forgetting Stuart's name.