Hannah is Pride. "You get the best of both worlds"? Try being humble next time, Hannah.
Miley, who absolutely counts as a separate character, is Wrath. It is said that if you fall victim to Miley's rage, "dang flabbit" is the last thing you hear before your untimely demise.
Jackson is Gluttony. Look no further than this GIF for proof of his insatiable appetite for destruction.
Lilly is Envy. Read between the lines, people. Lilly was jealous of Miley's fame from the get-go, and would have killed to take her place.
Oliver is Lust. "Smokin' Oken," you say? At a glance, it might not seem like Oliver gets much action, but secretly, he's an animal. The fact that he managed to win Lilly's affection in season three proves he's secretly some sort of powerful romance wizard.
Robby Ray is Sloth. It might seem like the head of the Stewart family has it all together, but really, all he ever wants is a nap. "Sweet nibblets," Robby. Your family is falling apart under your neglectful eye.
Rico is Greed. This one speaks for itself: He comes from a family of millionaires and still he works Jackson to the bone at his Surf Shop. Rico Suave is the personification of corporate evil.
