First Impressions:

Tybalt is aggressive, hot-tempered, and is quick to draw his sword or start a fight. Tybalt is the plays main antagonist and is threatening character to all the Montagues. He is very pessimistic and despises the Montagues. In the beginning scene he imediately draws his sword to start a fight with Benvolio but luckily the Prince arrives. (1.1) He would do anything to kill Romeo if not for his uncle Capulet (1.5).
First Appearance:
in 1.1.67-105
Tybalt was trying to start a fight with Benvolio. He tries to insult Montagues. 1.1. 72-73
"As I hate hell, all Montagues, and thee.
Have at thee, Coward!"

Tybalt also appears in 1.5. He overhears Romeo talking and immediately asks for a sword.
Capulet has a conversation with him trying to calm down Tyablt; lines 1.5.61-103
"This, by his voice, should be a Montague.--He enters with lines 1.5.61-62
Fetch me my rapier boy"

I am what I say:

Paraphrase (definition)
As I hate hell, all Montagues, and thee.
Have at thee, Coward! 1:1:72-73
I hate you, Montague like I hate hell.
Let's fight, coward!
Tybalt is very high-strung and can be easily provoked into a fight. He hated the Montagues a lot and
'Tis he, that villain Romeo. 1:5:73
Romeo is a villain.
Tybalt insults people a lot.
Boy, this shall not excuse the injuries that thou hast done me. Therefore turn and draw. 3:1:68-69
This will not excuse what you have done so we have to have a sword fight.
Tybalt is picking a fight with Romeo because he thinks that it has not what Romeo did to Tybalt in the past
This, by his voice, should be a Montague.
Fetch me my rapier, boy. 1:5:61-62
This voice I hear, must be a Montague
Go get me a whip, servent
Tybalt sees Romeo at the party and decides to go and kill him, for only As Romeo and many other characters in the play do, Tybalt makes the quick, split-second decision to go and kill Romeo, only for being born a Montague
What dares the slave
Come hither, cover'd with an antic face,
To fleer and scorn at our solemnity?
Now, by the stock and honour of my kin,
To strike him dead, I hold it not a sin. 1:5:63-67
Who dares to
Come here, covered with
To scorn our own
Now for the honor of my kin around me,
I will kill him, and it will not be a sin.

It fits, When such a villain is a guest: I'll not endure him.
When a guest is a villain I will not tolerate him.
Tybalt is very upset that Romeo showed up to the party.
What, art thou drawn among these heartless hinds? Turn thee, Benvolio. Look upon thy death.
You got out your sword to fight worthless servants? Turn around and look at who is going to kill you.
Benvolio wants to stop the fight and Tybalt just wants to join it.
Romeo, the love bear thee can afford No better term than this; thou art a villain. 3.1.61-62
Romeo, with the love I have, There is only on thing I can call you; you are a villain.
THis quote from Tybalt shows how much he despises Romeo and how he is clever on how he starts off saying he loves Romeo, but then he really hates him.