Please give a detailed character sketch of the Wife of Bath.

I have no argument with anything said in the first answer, but I'd like to add and/or emphasize a few things.

First, I think the Wife's sexuality is even more important than the first answer implies.  It is not just that she is experienced sexually.  Instead, she is actually relatively lustful and likes sex.  This would have been an unusual way to portray a woman in Chaucer's time.

The other thing is that her relationship with her husbands was a little more complex, in my opinion.  To say that she just used sex to control them is to underestimate her.  Instead, she used her brain as well or more.  She manipulated them psychologically by accusing them of infidelity and other sins.

All in all, I think her main character trait is her aggressive pursuit of what she sees as her own best interests.  She is willing or even eager to act in more "masculine" ways to achieve these interests.