Lee wanted to create a team of heroes who were different
from the traditional superheroes. He came up with the
idea of mutants. He decided to make the leader a man who
you would expect to be very weak, but is the most powerful
of them all. Professor X, so he made him in a wheelchair
and gave him a powerful mind capable of telepathy. For
strength he thought of someone who looked like a beast,
but was the smartest and most schooled of them. He created
Iceman as the opposite of the Fantastic Fours Human Torch.
The lovely telekinetic/telepathic marvel girl and the
straight laced somewhat tragic field leader Cyclops. Who
always has to wear a ruby visor to cover his eyes, as
he could not control it. Mr. Lee also created the master
of magnetism and archrival yet friend to the professor,
Magneto also the Blob, Juggernaut, Toad among others.
He originally wanted to call the book "The Mutants" but
his publisher thought that the average comic book reader
wouldn't know what "mutant" meant. So, he thought about
it for a while and realized that the characters had an
extra power & their leaders name was Xavier, so he called
them the X-men.