Erkal was one of the most intelligent of all the super mutants. He was the one who led a research dedicated to curing mutant sterility. The lab was filled with his test subjects - mutant freaks, the deformed super mutants on which he performed several tests. When the facility was invaded by the Brotherhood of Steel squad led by the Warrior, he begged them not to harm his research.
He wears a white tent canvas, crudely cut to resemble a lab coat. He wears glasses although the Master has long established that super mutants do not need to wear glasses as their vision is quite good.
"Um. Who are you and why are you here? Oh dear! You're Brotherhood! Please don't destroy my research! Do you realize what kind of resources and luck it took to make a functioning lab like this? We are so close to a cure, so close. What would the Brotherhood gain by destroying this research? Please, just leave me and my equipment alone. We can't stop now. Do you understand? This is my people's last chance!"