Green-Eyed Monster: Gets it hard in "There's Something Fitchy Going On", though he also admits that he's still figuring things out and, at the least, he loves Riley enough as a friend to avoid being completely destructive.
The Unfavorite: While he was never treated badly, Bonnie tends to dote on pro-athlete Danny and seems more indifferent to former troublemaker Ben (she mentioned in one episode he got really good at making fake IDs.) When moving things out of storage, the majority of the stuff she brought them was boxes of Danny's trophies.
"Well Done, Son!" Guy: Occurs in "The Wheeler and The Dealer" where everyone thinks he's basically a lazy unmotivated person and he's intent on proving them wrong. It's suggested that this sort of attitude and behavior has been going on for a while. That said, he kind of is Brilliant but Lazy - his mom points out that he can't just jump in for two days and suddenly become Danny's manager when his actual manager (their mom) has spent years supporting Danny, taking him to practice, going to games, and otherwise being there.
Dogged Nice Guy: When it comes to Riley, he's the complete polar opposite to everything he normally is.
Dumb Muscle: At times, Danny doesn't come across as too bright.
Bonnie: It takes him a while, but he gets there eventually.
Embarrassing Tattoo: He plans to get his girlfriend Amy's name tattooed on his wrist to show his devotion to her, but because he's so heavily drunk, he ends up with Riley's name. He eventually does get the "Amy" tattoo on his other wrist... only hours before Amy dumps him.
One Head Taller: Derek Theler is 6'5 so he ends up being comically taller the rest of the cast.
Security Blanket: His lucky jersey from high school, which he wore under his uniform at every game (and never washed). Until Tucker shredded it in the washing machine, then he realized he could move a lot better without the undersized garment restricting his movement.
Violently Protective Boyfriend: Interestingly enough, despite never actually having been Riley's boyfriend, Danny still fits in this role. Hurt her in any way, and you will have six-and-a-half feet of pissed-off pro-athlete raining down on you. His own brother Ben has found this out repeatedly.
What, Exactly, Is His Job?: Averted in the sense that she said in a video dating profile she was unemployed, but it still leave the question: How the hell does she have the money to live in New York City [while it isn't the most expensive city in the world anymore (that's Tokyo,) it's still up there,] and spoil Emma at every opportunity? The closest thing we've had to an explanation is revealing her ex-husband was a successful realtor, so she might just be leeching off alimony. She's also revealed to be Danny's manager so while she may not consider that her 'job' (in that she does it as much to protect Danny as anything else), he or the team may still pay her or otherwise cut her into his salary.
Beware the Nice Ones: When she got fired from her job at a law firm for being "too nice" and not having the killer instinct a lawyer needs, she (thanks to a Wounded Gazelle Gambit from Bonnie) threatened to sue the firm for Bonnie's (pretend) injuries, and threatened to make every single dirty trick the firm ever did a matter of public record. She ended the whole thing with a big smile and saying "Who's too nice now?" She got her job back.
Butt Monkey: On more than one occasion, the insanity of Ben and Co. has spilled over to cause mayhem in her life.
First Love: Riley is suggested to be this to Danny since he's had a crush on her since they were little. Considering how completely devoted he is to her, there's the implication that every other relationship he's had ultimately fails because they never compare and because ultimately, he's emotionally committed to Riley. See "I'm Not That Guy" where the moment Riley is in trouble he rushes to the rescue - despite that he's suppose to be going on a date with the girl he's seeing.
Go-Getter Girl: Riley has devoted herself to graduating from college, getting into law school, and successfully transforming herself from Fat Pants Perrin to Hello, Attorney!. Though living up to the image she's created can sometimes get to her.
Oblivious to Love: Riley is really clueless about Danny. In "There's Something Fitchy Going On", she finds out and it's implied she was ready to return the sentiment... until Danny's current girlfriend turns into a Moment Killer.
Passionate Sports Girl: She was really into sports as a teenager and "Take Her Out of the Ball Game" shows that she's still got it.
The Other Darrin: Because of the fact that the show took a large break between Seasons 1 and 2, the first set of twins aged out of the role. At least one cast member has said they hope they'll start aging Emma up to keep the current set of twins around, but whether or not they do remains to be seen.