Is it true that a husband chooses his wife in Paradise based on her righteousness in this world, and are the hadiths about choosing a wife for her best character weak or sound, and is it true that a wife will be with her last husband in this world in Paradise?

If a man marries more than one woman in this world, then when he enters Paradise, they will enter with him and be his wives therein. There is no evidence for the details mentioned in the question. As for a woman who had several husbands, a weak hadith states that she will choose the one with the best character among them. A sound hadith states, "Any woman whose husband dies and she marries after him, she will be with her last husband."