How lovely! I'd like an opera like that. I *think* I'm mezzo-soprano (always sing alto) but I can sing the contralto part if there is one, which, in 15 ish years of choir, has only been 3 times. I can also sing men's tenor if the tenor is sick....certainly awkwardHear hear!
My range is contralto. (Think Karen Carpenter.) It pissed me off that the sopranos and tenors got the best lines.
If I could write an opera, the hero would be a bass or baritone. The heroine would be a contralto. They would have lots of servants who were sopranos and tenors.