How does voice affect characterization? Voice and characterization have the same definition.
It is used to deliver all direct and indirect characterization.
It has no impact on the scope of characterization available.
It is what the characters in a text always use to speak to the readers.

Afirefighter is a rescuer extensively trained in firefighting, primarily to extinguish hazardous fires that threaten life, property and the environment as well as to rescue people and animals from dangerous situations.  just cut some parts to make them shorter and add some of your facts or what describes them most. or what they are supposed to do.