I would suggest Guild Wars 2 when it comes out. Although it's not free, you only have to buy the game itself, there are no subscription fees(sorry if the non-free part really bothers you). But at the same time it should have really good character customization, in terms of appearance and playstyle.
Even if having to buy it discourages you, it's worth at least looking it up for the sheer amount of changes ArenaNet is making to the MMORPG genre.
community made wiki with lots of info: http://wiki.guildwars2.com/wiki/Main_Page
the main GW2 site: http://www.guildwars2.com/en/
The three main changes are the personal storylines, dynamic events and non static combat. They are doing away with quests and grinding, replacing them with a dynamic event system.
http://www.gdcvault.com/play/1013691/Designing-Guild-Wars-2-Dynamic
Combat is also going to be dynamic, faster paced, and more skill-based(especially their structured pvp). Plus there's a personal storyline, where you can make choices.(the results are mostly reflected in the rest of the story and your own home instance.)
Each individual profession(the classes) are based more on different playstyles than the holy trinity roles. Each role is being replaced with their own broader terms. (damage vs DPS, control vs tank, support vs healer). Control being instead of just standing in the way of the enemy and taking hits, you can stop them by crippling them or block their movement with wards. Support can be protecting allies with barriers, or giving them a variety of buffs(known as boons in game) and healing being only a very small portion of ways to help your team. Damage is more than just trying to dish out as much damage in as little time as possible, it expands to things like slower wide spread havoc or burning them; and many professions can use the same type of weapons, but have unique uses to them when compared to other professions.
I would say based on what they're doing with this game it would be well worth your money.