Who is Andrew (Ender) Wiggin from Ender's Shadow and what is their importance?

Ender is older than Bean and the chosen leader for the battle to defeat the Buggers. He has natural leadership abilities and intelligence that come close to Bean's level. Although in this story Bean is the protagonist, Ender is the protagonist in an earlier story that the author wrote, entitled Ender's Game. This makes Ender almost an equal protagonist as Bean, although without the usual point-of-view treatment. Ender leads the final battle, but it is Bean who delivers the final fatal blow to the Buggers.