Tybalt and Mercutio are extremely loyal characters who are ready to fight.
In Act III, scene i, when Tybalt comes up to talk to Romeo or pick a fight with Romeo, Mercutio provokes a fight with the words:
And but one word with one of us? couple it with
something; make it a word and a blow.
You shall find me apt enough to that, sir, an you
will give me occasion.
Tybalt's target for fighting is Romeo, yet Mercutio is ready to take a blow (a punch) right now. Tybalt confirms that Mercutio will likely give a reason to indeed fight.
Tybalt wants to get after Romeo because of his loyalty to his family, the Capulets. Mercutio ends up dying because of his loyalty to Romeo and thereby his family, the Montagues.
Both die as a result of lacking a vital piece of information: that Romeo and Juliet have married. When confronted by Tybalt, Romeo replies that "...the reason that [Romeo] has to love [Tybalt]/ Doth much excuse the appertaining rage...." (III.i.60-61). Romeo never explains what "the reason" is. Mercutio, also unaware of the reason, becomes angry because he believes that Romeo is being cowardly and calls Romeo's behavior "O calm, dishonorable, vile submission!" Had Romeo told one or both of them about his commitment to Juliet, their deaths may have been avoided.
Tybalt and Mercutio are both loyal to their own sides- Mercutio to the Montagues, and, Tybalt to his family the Capulets. Mercutio and Tybalt are both a-lot of like, yet, have differences
Both fight for their name
Both die because of Romeo, Romeo doesn’t kill both, only Tybalt, and, Tybalt kills Mercutio because of Romeo’s immature acts.
Mercutio is all fun and games, Tybalt is not.
Mercutio is a loyal family friend to the Montagues, Tybalt to his family the Capulets.
Tybalt is dearly missed by his Aunt, Uncle and Cousin.
Mercutio only by his friends (that we know of)
With Love and Care,
They both die at the hand of romeo...