The choice of Morality (hero or villain) has the largest effect on your game experience of all the character creation choices. Only heroes can do the hero quests and vice versa. Morality will affect what quests you do, your mentor options, what factions you want to earn renown with, and which group of players you are able to interact with socially. It is not possible for heroes to chat (unless you use the versus chat) or group with villains, so playing the same morality as other players you want to interact with is important. Note that the choice of morality is more rigid than that of mentor; because while it is possible to do quests associated with one of the other mentors for your morality, you can never do anything with the part of the game for the other morality.