What are the differences between himself and Charles that Laurie lists in "Charles"?

Laurie describesas how he wants

to see himself.

When Laurie goes to kindergarten, he
comes
home every day talking about a bad boy named Charles who gets in all
kinds of trouble.  His
parents are concerned, but decide that he might as
well meet people like Charles now.

One day his mother asks
him what Charles looks like and what his last name is.  Laurie
evades the
last name question, but answers the first.

Hes bigger than me, Laurie said. And he doesnt have any rubbers and he doesnt
wear
a jacket.

Clothes are important
to Laurie. They are a
symbol of maturity,  This is why he describes the
clothes Charles wears and nothing
else.

 Of course,
Laurie cant really answer questions about Charles because
he does not exist. 
Charles is Lauries alter-ego.  He is the little boy that Laurie made up so
he
could tell his parents all the bad things he had done, without them realizing it
was
him.