Roxy- I'm pretty sure they would euthanize her on site. With the stresses of being in a shelter and with strangers around her, she would 100% bite someone, and be put down.
There's not a doubt in my mind. She has too many quirks and when coupled with her no fear/hesitation for snarling/snapping... The story would not be good.
Hades- He would probably die of a heart attack in a shelter first off, but I'm pretty sure that even some people who are deathly afraid of pitbulls would take interest in him. He most definitely would NOT stay at any shelter long.
He could pretty much go to any home that loves him, dogs/cats/kids whatever.
If the proper time is taken to introduce him to another dog or cat, he would get along just fine, and he absolutely adores children.