I'm dealing with this in another organization I'm president of...
A great leader is someone who is unafraid to make decisions -- even unpopular ones -- for the benefit of all.
A great leader needs to be able to see the big picture.
A great leader needs to be
gracious.
A great leader needs to be woman enough/man enough to admit when she/he has made a mistake, and to face whatever consequences that arise as a result.
A great leader needs to be able to relate to everyone within the organization, even if it's a skanky you-know-what who you can't stand the sight of.
That's all I can think of right now.