Rose could be considered the leading female in Homestuck. Though often cold and serious, she's also sarcastic, witty, and incredibly intelligent, and her voice should reflect that-wise, intelligent, and rather down-to-earth. She would probably be an alto or a mezzo.

It was hard to find exact roles to base Rose off of, since she falls so delicately between 'teenager' and 'snarky 40 year old', but some ideas to base her voice off of (And song suggestions!) include:

FOR BELTERS:
Wednesday Addams,The Addams Family--[Pulled, Crazier than you]
Eponine, Les Miserables [On My Own]
Veronica Sawyer, Heathers [Dead Girl Walking Reprise, Fight For Me]

FOR NON-BELTERS

Mama Morton, Chicago--[When You're Good To Mama] (please make her more youthful, as rose is young)
Angelica Schuyler, Hamilton--[Satisfied, Schuyler Sisters]
The Baker's Wife, Into the Woods-[Moments in the Woods, It Takes Two]

Feel free to sing any song, as long as it is from theatre!