Black

Black is a young man who aspires to be the Champion of the Unova Pokmon League. He has been dreaming of this since childhood nine years to be exact. However these dreams fill his head to the point where he cannot think about anything else and any attempts to cause him to pass out from mental exhaustion. With his Munna Black can have him eat his dreams which he refers to turning his mind from blank white to solid black. Doing this allows him to think much more clearly become smarter and improve perception. Also when he does this he apparently sees in hexagons. Because of his dreams causing him to forget about other things Black has the tendency to do things without considering the consequences of his actions and their effects on other people. As the series goes on Black slowly begins to consider the feelings of others and even manages to be able to think about other things for brief periods of time. He has been described as hot blooded by several characters due to his loud nature and tendency to do things on his own. He doesnt understand show business like White does and many aspects of it surprise him such as Gigi and Tep getting to stay in a hotel room while he and White have to camp out. He is very familiar with libraries and went there frequently as a child allowing him to complete Lenoras Gym puzzle very quickly setting a new record in the process. Blacks tendency to dream also causes him to miss the things happening around him such as when he completely forgot his promise with his friends Cheren and Bianca once he received the package holding the Pokmon and Pokdexes they were going to receive. source: bulbapedia