Blue is a fan playable character based on the Equinox-Twilight's creations, but recreated by topcat13. He is a semi-clone of Blade. However, his attacks are slightly more powerful. He is an unlockable character who could be available by clearing Adventure mode with Blade on normal or higher. He has medium-light weight.
In Super Smash Flash 2
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Blue was previously confirmed to appear again in Super Smash Flash 2, as an unlockable character with a different design and new attacks. However, in May 18, 2012, was announced that he would be removed from the roster, along with Blade.
Blue's sword seems to be a flamberg type rapier. Note the hand shield under his right hand. This "Flamberg" somewhat emits fire, much like Blade's own katana, which emits electricity.