Carmen

Musicals

100

In West Side Story, this character kills Bernardo

Tony

200

The main characters (2) in Chicago (bonus points [not really] for last names)

Velma Kelly and Roxie Hart

300

In Wicked, this is Elphaba's last name

Thropp

400

This actor plays John Laurens/Phillip Hamilton in Hamilton OBC

Anthony Ramos

500

The number of kids Maria cares for in the sound of music

Seven. 

Liesl, Friedrich, Louisa, Kurt, Brigitta, Marta, & Gretl