Blade the Swordman Hedgehog is a fan character created for Super Smash Flash and Super Smash Flash 2. He's a character similar to Sonic, as he can Spin Dash as a move during a jump. He does, however, have a sword.
In Super Smash Flash
In Super Smash Flash 2
Blade was previously confirmed to once again appear in this sequel, but with a totally new design, but with some similarities to his Smash Flash 1 counterpart. He now looks more similar to Knuckles in this game. His fate is currently unknown.