Development
Mercutio is first introduced in Act I, Scene 4, where he is seen joking with Romeo and Benvolio about love. He continues to play a prominent role throughout the play, appearing in several scenes and interacting with a variety of characters. Through these interactions, we learn a great deal about Mercutio's personality and motivations.
For example, we learn that Mercutio is a loyal friend to Romeo and Benvolio. He is always there for them, even when they are in trouble. We also learn that Mercutio is a witty and intelligent man. He is quick to make clever jokes and observations, and he is always able to see the humor in a situation.
Personality
Mercutio's personality is complex and multifaceted. He is a happy-go-lucky character who loves to have fun, but he is also capable of great seriousness and passion. He is also a skilled swordsman and is not afraid to fight for what he believes in.
Themes
Mercutio is closely tied to the play's themes of love, fate, and violence. His death in Act III, Scene 1 is a turning point in the play, and it leads to a series of tragic events. Mercutio's death also highlights the play's theme of fate. It seems that Mercutio is fated to die, and there is nothing he can do to change his destiny.
Comedic Relief
Mercutio provides much of the play's comic relief. He is a funny and clever character who is always able to make the audience laugh. His jokes and observations help to lighten the mood of the play and provide a break from the more serious scenes.
In conclusion, Mercutio is a believable character in Romeo and Juliet because he is well-developed, has a clear and consistent personality, is closely tied to the play's themes, and provides comic relief. He is a complex and well-rounded character who adds depth and richness to the play.