Shaden

Shaden is Ender's shadow clone.
He used to be a main enemy of Ender, but when he found that the Dark Master was just using his power, and was going to destroy him, he sided with Ender. He had originally thought that he would get to rule part of the Shadow Empire. 
He was created after Ender's first battle with Sonake.
He is the only other entity able to create Shadow Creatures, the only other being his ex-master.
He is known for having a running feud with Hank J. Wimbleton, Deimos and Sanford. They once fought, were Shaden proved his power by wrapping the three in coils of shadows, almost killing them, but Ender stopped him. This isnthe only time that Sanford has ever stopped smoking.