Gandalf doesn't name said demon. His name/title is "Durin's Bane" (for causing the dwarf lords of that name a lot of trouble), and his 'class' is that of a Balrog.
Gandalf, having existed in the world since its beginning, came to Middle-Earth some 2000 years before the Ring War acccording to Appendix B.
Please don't expect to receive answers by e-mail, and do bear in mind that you should read the book yourself, especially if it is for school.
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