What's Apollo & Opal?

Apollo
_{A 31 year old hitman, expert in tracking down and eliminating his victims, has a strong addiction to the surge of adrenaline, toying with death with his contracts given by others in the Slumps. He isn't too fond of Opal, especially with her strong dislike in his coat, often leading to violent physical fights between the two. Apollo just wants to do his job in peace... Maybe getting rid of her isn't too much of a bad idea!}

Opal ???
_{35 years old, seemingly mentally disturbed, Opal is fierce but uneasy, refusing to let anyone by her side scared if being taken advantage of. She is bitter to black furred cats and most male cats, believing the former are of bad luck and the latter that they are shameless, disgusting monsters. They want nothing more than to left alone, which Apollo doesn't help with....}

Dr. Takoda
_{An old grump who is blunt with his wording and reserved, he is an expert illegal doctor in the Slumps, healing criminals at a low price. Apollo is his top patient, an annoying one, constantly tending to his wound and closing up his deep injuries. Although they constantly fight over Apollo trying to sneak an unearned lollipop from his jar, perhaps a small part of him enjoys his whimsical presence.}

Cyrus
_{Laid-back and egotistical, Cyrus is one of the few lucky ones to be wealthy in the Slumps.
He seems to know something of Opal that her allies don't know of...}