In the Adventure games though? The other characters' gameplay were entirely different genres (aside from SA1 Tails, which is one of the few gameplay styles the Adventure games got right).
Tails was like Sonic, but he could fly, and Knuckles was like Sonic, but he could climb and glide.
Wed 23rd Jun The difference between Tails and Knuckles in 2D and Tails in Knuckles in Adventure was that Tails and Knuckles gameplay in 2D was similar to Sonic but with a unique twist.