Hotblooded Heroine

One or more of the heroines is hotblooded.

For those uninitiated, a hotblooded character feels extremely passionate about justice/love/protecting her friends (there are also other types, like hot blooded artists, but these are usually played for laughs) to such a degree that she WILL overcome challenges that aren't humanly possible.
Hotblooded characters regularly keep fighting after all others would've died, overcome mind control, poison, disease, gravity, radiation and fate itself by sheer guts and passion.

The most prominent example of a hotblooded heroine in recent time is probably Kizaia Hinokami of Trample on Schatten.