Next up is Sub-Zero's student, Frost.
Frost made her first appearance in Mortal Kombat: Deadly Alliance as Sub-Zero's apprentice, taking the character archetype of the overly ambitious fledgling. Her dedication to fighting and learning is overshadowed by her arrogance and hostility towards anyone she perceives to be greater than her, including her own sifu, and Sonya.
For all we know, Frost had a minor cameo in the story mode of MKX. I thought it felt random for the most part. She didn't die, though. Sub-Zero just froze her and promised to "deal with her later". I think Frost deserves to be in MK11. One way I would differentiate her from Sub-Zero is by making her more of a "Speed" character (no, not like The Flash), while Sub-Zero would be more of a "Power" character.
So Frost gets a YES from me.