Character is an important factor for anyone. In baseball, it's definitely important.
In baseball, character is referred to as makeup. It encompasses those things that make a player who he is on the field and off of the field. It doesn't relate to a player's talent level, only his personality. Every individual player has his own makeup, but teams also have their own character. It's the combination of the character of each member of the team. Some teams are greater than the sum of their parts, while some are equal to or less than that sum.
A player's makeup is defined by a number of different attributes: