http://naruto.wikia.com/wiki/Demons here is the list of all the demons.
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No orouchimaru doesn't have a tailed demon from naruto
the people in black cloaks with red clouds are called the akatsuki. they are the ones who took the demons 1-7 to their hide out.
no. he is part of an organisation called the akatsuki. they akatsuki plan to capture all of the jinchiriki's (demon hosts for egsample gaara and naruto) and remove the bijuu's (demons), control them and use them to take over the world.
there are 9 tailed beasts (demons) . but they have been taken by the akatsuki. naruto is the nine tailed beast.
Naruto Shippuuden does not have "Seasons". It has Sagas (like all Anime series') The Saga in which Naruto defeats Pain is called the "Pain Invasion Arc".