Girl Power
Tucker and Danny would probably be dead without Sam.
Sam is their rock and the team's voice of reason, though she can get a little extreme sometimes. She lets them know when they're being insensitive idiots, when they're missing the bigger picture, and can kick some major ghost butt too.
Eventually Danny also acknowledges Jazz's abilities, too. His sister is smart and clever in ways he'll never be, but she's also inherited some mean skills when it comes to ghost fighting and there are times when she's saved all their lives, too.
Speaking of which, his mom is a force to be reckoned with. Half of the reason Danny's terrified of telling her of his half-ghost status is because he's afraid of Maddie fully killing him for not telling and putting himself at risk all the time.
He hopes Valerie comes around at some point, too, because she's so skilled and powerful in her own right. She's evenly matched with him, what with her training and technology and motivation. And she's befriended Danielle, at least – the clone given a second chance, a person in her own right, and probably just as powerful as he is – so maybe there's hope for him too.
Half the town would probably be dead if it wasn't for all the insane women Danny knew and respected and loved.