what are some lines in the play Romeo and Juliet that describe Mercutio?

Answer 1

In Act II, Scene II (http://www-tech.mit.edu/Shakespeare/romeo_juliet/romeo_juliet.2.2.html) Romeo says (referring to Mercutio): He jests at scars that never felt a wound.

You can read details about this line here:
http://mb.sparknotes.com/mb.epl?b=2437&m=1187720&p=3&t=337561&w=1

Answer 2

MERCUTIO
True, I talk of dreams,
Which are the children of an idle brain,
Begot of nothing but vain fantasy,
Which is as thin of substance as the air
And more inconstant than the wind, who wooes
Even now the frozen bosom of the north,
And, being anger'd, puffs away from thence,
Turning his face to the dew-dropping south.
Here mercutio describes himself.
Site to look up
The complete works of william shakepere

Answer 3

THE whole Queen Maab speech