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There would be an infinite number of possible sizes.
Countries all over the world, past and present, have been producing coins for thousands of years. There would be millions of different types of coins.
cuz one size and shape would be boring
Assuming that you are referring to US coins, it does not seem to be possible, even if obsolete denominations are allowed, to use five different denominations of coins to make exactly 50 cents. I am not aware of any other countries that use "cents" that would allow you to do so either. However, in Czarist Russia, and in the Soviet Union, there were coins in the denominations (among others) of 2, 3, 10, 15 and 20 kopeks, the total of which 5 coins would be 50 kopeks.
nothing would happen