Chazz is a dwarf and came into the Rat’s Nest in the spring of 2071. He used to be a firefighter and he’s still wearing heavy bodymods and cyberware that enables him to better deal with heat, smoke and fire. He also has rigger controls for drones and other equipment.
When the clinic was destroyed, Chazz risked his life to search for survivors and he did save Liz. His former colleagues, who arrived later, recognized him and so the story got spread around how Chazz is responsible for the death of a whole unit of firefighters. The facts are not entirely clear, but there was a trial, it ended with acquittal because of a formality and Chazz was only dismissed.
Neil has asked Chazz to work at the clinic.