In William Shakespeare's play The Merchant of Venice, many of the characters are interesting. In all honesty, I cannot think of any of Shakespeare's characters which I find not interesting.
Bassanio is interesting based upon the fact that he is willing to go further in debt to Antonio in order to take a chance at love. Bassanio has only heard of the heiress, but knows that he must travel to her to "try his luck." This admirable, and hopeful love, make Bassanio both an endearing character and a superficial one. Regardless, he is very interesting.
Antonio is an interesting character based upon the fact that he loves his friends so much that he is willing to help them in any way he can. He knows Bassanio's trip to find "love" is not a guarantee. Regardless of this fact, he is willing to loan him more money in order to try.
Portia is a very interesting character as well. Her mannerisms a humorous and the entire "game" which is played seems both ingenious and ridicules at the same time. The way that she acts around her "suitors" (though I would simply call them game players) offers a hilarious look at what people with money think they can do, and get away with.