You want to play a hobbit? OK, but you don't get to leave your starting village. Everyone knows hobbits don't like to travel.
Unless you're a Took, have a smidgen of Took ancestry, or are friend of a Took who drags you into an adventure. Or a young lad or lass, from any family, who happens to be inspired by a passing firecracker salesman.
...or unless you're a Outsider tramp-hobbit from the West of the World:
"The Shire-hobbits referred to those of Bree, and to any others that lived beyond the borders, as Outsiders, and took very little interest in them, considering them dull and uncouth. There were probably many more Outsiders scattered about in the West of the World in those days than the people of the Shire imagined. Some, doubtless, were no better than tramps, ready to dig a hole in any bank and stay only as long as it suited them."
You want to play a wizard? OK, as soon as one of the current 5 wizards in the world dies off (assuming they don't come back a different color of course)
The Five Wizards were only those who landed in the Grey Havens in the North-western continent of the Old World (i.e. Europe). Others of their Order presumably sailed to other continents.
"
Of this Order the number is unknown; but of those that came to the North of Middle-earth, where there was most hope (because of the remnant of the Dúnedain and of the Eldar that abode there), the chiefs were five."
That statement could even imply there are more than Five Wizards even in the North of Middle-earth, since the Five are only the "chiefs" of those that came to the North. I think this one statement could allow wiggle-room for mannish apprentices of the Order of Istari.
In the esoteric tradition of Tolkien's day (e.g. Owen Barfield's Anthroposophy), there are said to be twelve Bodhisattvas, of whom five are enfleshed at any one time.
The
Roverandom story is set in the same legendarium as Middle-earth (though in modern times), and there is a wizard name Artaxerxes (from Persia), and a sand-sorcerer named Psamathos Psamathides. Though these are not Istari.
"[The] "Order of Wizards" was quite distinct from "wizards" and "magicians" of later legend; they belonged solely to the Third Age and then departed [...]" (UT)
JRRT says the Blue Wizards of the East probably founded magic traditions:
"I suspect they were founders or beginners of secret cults and 'magic' traditions that outlasted the fall of Sauron."
One could play a mannish Magician in the Third Age, no problem. (This is not a prompt for the usual "Are/is there magicians/magic in Middle-earth?" flamewar.)
