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Input: His brother Kunio Hatoyama served as internal affairs minister in Aso's cabinet but resigned after a falling-out in June.
 Yukio Hatoyama previously served as the party's secretary general and loyal lieutenant to his predecessor Ichiro Ozawa  defending him through a political donations scandal that finally cost Ozawa his job.
 Under Hatoyama  the DPJ has submitted a bill to the parliament seeking to introduce a blanket ban on all political donations by companies and groups excluding registered political groups within three years.
 Ironically  HatoyamaHatoyama himself came under fire in late June for the accounting irregularities of his fund-raising body.
 He said 21 million yen (220 000 dollars) had been wrongly recorded since 2005  an admission that followed media reports that the donors' list included names of dead people and citizens who have denied giving him money.
 Hatoyama graduated from the University of Tokyo  received a Ph.D in engineering from the United States' prestigious Stanford University  and was an assistant professor in the School of Economics at Tokyo's Senshu University.
 In 1986  he first won a lower house seat in a Hokkaido constituency as a ruling LDP member  and he has been re-elected six times since then.
 He left the ruling party in 1993 and -- after forming a now-defunct party with other LDP defectors to temporarily oust the ruling party -- co-founded the DPJ in 1996  going on to lead it for the first time from 1999 to 2002.
 Hatoyama is married to a former actress  Miyuki  also famous for her cookbooks  and has one son  who teaches engineering at a university in Moscow.
 His hobbies  according to his website  include touch football  tennis  watching baseball  listening to music  karaoke and computing.

Japan's Hatoyama the 'alien' promoting a fraternal society