An extremely young Archangel, Mariel was known as a child prodigy. 
Despite her innocent look, she’s extremely aggressive and merciless. With quick, dextrous movements of her young limbs she takes great pride in breaking her enemies through thoroughly attacking their weak points.

Receiving divine punishment from one as young as Mariel  usually brings great shame and immoral feelings to the vanquished. Even minor sinners didn't got spared, which itself almost got her labeled a criminal.