who is the least admirable character in huckleberry finn? explain

I like Jim. Jim is both nice and entertaining. He is an escaped slave who cares much about his family. He is perhaps the only true altruistic character in the book. He has a sincerity about him which most characters lack. He seems to hold no malice against those who enslave him. All he wants is his freedom and his family. He gives to Huck freely and looks for the best in people.