Buff wife? Yes please. Also please let her be regular, seeing old man with kids fighting is ok, just don't want them to be romantic interests.
Also please let the newbie killers be a short segment. I know that there usually is a lot of pacifism from the main characters, but letting a bunch of killers go does not make you a good person. Turning them in is the morally correct thing, but most likely nothing will happen to them in lack of proof. But he could circumvent that by just order them to go to the governing agency and confess.
Getting rid of them in the veil of dungeon deaths is the correct thing for your safety. Hell, he could just order them to walk in to a monster group and not fight back if he don't want to kill them by his own hands.