My thesis is "In Romeo and Juliet, Juliet is the true hero because of traits she possesses." for that thesis, i need to pick 3 traits, and...

(Regrettably, my response to this question was eradicated
when I posted shortly ago. So, I will try to duplicate it here for
you.)

As part of your introduction, you may wish to refer
to Aristotle's Poetics in which the tragic hero is defined.  That
Juliet possesses nobler stature than Romeo and, as such, is the true tragic hero can
certainly be defended.  For, she is more sensible than Romeo, she is of a higher moral
fiber, and she is more responsible.  Here are some suggestions for
support:

1. more
sensible

In
the first Act, Juliet's mother, in an extended metaphor, describes Paris as a potential
suitor.  Rather than refusing, Juliet promises that she will consider
Paris:

I'll
look to like, if looking liking move;

But no more deep will
I endart mine eye

Than your consent gives strength to make
it fly. 1.3.97-99

 When she
learns from the Nurse that Romeo is a Montague, she immediately recognizes the danger
whereas Romeo reacts differently

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JULIET

My only
love, sprung from my only hate!
Too early seen unknown, and known too late!

Prodigious birth of love it is to me
That I must love a loathed
enemy.1.5

ROMEO

    Is she a
Capulet?/O dear account! My life is my foe's debt.
1.5

Later, after Juliet and
Romeo are married she urges him to hurry away when he wishes to linger.
(3.5)

When she hears Romeo in the orchard she is fearful
that he will be killed if the guards recognize him.
(2.2.)

She cautions him against swearing against "the
inconstant moon" 2.2).

And, when the Nurse suggests to
Juliet that she marry Romeo anyway, Juliet reacts to this irrational suggestion.
(3.5)

And, although she is hysterical, threatening
suicide after her angry father insists that she marry Paris, Juliet does go to Friar
Laurence in the hopes that he can offer a solution to her problem. (4)  When he gives
her the vial she does consider all the consequences before she drinks from it.  This act
contrasts with Romeo's rash purchase of poison from the poor apothecary and his swift
downing of it in the tomb.

She carefully considers the
consequences of drinking the vial, but decides that Friar Laurence is right: "For he
hath still been tried a holy man" (4.4.29)

 Of course,
Juliet's final act is foolish, but she does act rather sensibly
otherwise.

2. of a higher moral fiber (nobler
stature)

Juliet discourages Romeo from
kissing her when they first meet, suggesting that palms touch when pilgrims meet in the
sonnet that they both share (1.5)

She would not have
impulsively killed Tybalt.

Juliet is appalled when the
Nurse suggests that she commit bigomy by marrying Paris.
(3.5)

She does not reveal to her angry parents that she is
already married out of loyalty and love for Romeo because she knows doing so would
endanger him. (3.5)

Juliet does not buy poison from a poor
apothecary as does the unethical Romeo.

Juliet does not
blame fate for what happens as does Romeo who declares in Act 3 after slaying Tybalt,
"O, I am fortune's fool!" and impulsively cursing fate after he learns of Juliet's
"death," "I defy you, fate!"

3.  more
responsible

In the first act, Juliet is with
her mother and Nurse; she does not hide from her parents, causing them great
consternation as does Romeo.

Juliet is slower to promise
Romeo her love--"Wilt thou leave me so unsatisfied?" he asks her in the orchard scene.
(2.2)

In the orchard, she wants to be with Romeo, but she
tells him, "...I should kill thee with much cherishing" because the guards will come.
(2.2)