For the recolors, there's not much to say other than they're recolors, but I think they're fine though. They remind me of the Mario shows.
For the ground-pounding sprites, they look fine, but one thing I'd suggest is raising the legs one pixel. Other than that, they're looking good. The Ground-Pounding Wario sprite reminds me of Wario Land 4.
The blinking sprites look good.
The Kirby sprites look good so far. Keep it up!
For Spiny, they look good so far, I'd make the shell animated like you did for Koopa Troopa's shell sprites.
I really like the effort you put into these sprites, and I also like how you used Mario and Luigi's design from the original Super Smash Bros.
For the ground-pounding sprites, they look fine, but one thing I'd suggest is raising the legs one pixel. Other than that, they're looking good. The Ground-Pounding Wario sprite reminds me of Wario Land 4.
The blinking sprites look good.
The Kirby sprites look good so far. Keep it up!
For Spiny, they look good so far, I'd make the shell animated like you did for Koopa Troopa's shell sprites.
I really like the effort you put into these sprites, and I also like how you used Mario and Luigi's design from the original Super Smash Bros.