Beware the Nice Ones: Even Phil has his limits, and when he's pushed to those limits, he gets RESULTS.
Bumbling Dad: Justified somewhat by his being allergic to many materials commonly used in home repair. He is, however, shown in "Fifteen Percent" to be competent with technology to a far greater extent than his wife or father-in-law.
Hidden Depths: In "See You Next Fall", Haley talks Alex out of her mean-spirited middle-school graduation speech by admitting that she is actually very anxious about whether she'll graduate from high school with her own class or not.
Although not as clever as her younger sister, Haley does have flashes of brilliance.
Determinator: In "Someone To Watch Over Lily", Alex reveals that she hates playing cello but continues to do so because she's never quit anything in her life.
Extracurricular Enthusiast: She plays the cello, plays lacrosse, and has participated in a bottle-collection program to help build schools in third-world countries. Note that she doesn't do all this because she loves all the activities, but rather to pad her resume for when she has to apply for colleges.
Nerds Are Sexy: She gets her fair share of attention from boys. When Haley first sees her fanclub of the nerdy boys, Alex smiles and tells her "You have your fans, I have mine. Someday, yours will be working for mine."
Not so Above It All: Case in point, she once tried to pass off as a medical student and passed out after seeing a C-section.
Genius Ditz: Luke occasionally shows signs of this. He's also proven to be a magician prodigy in the making. Probably a mild case of Actor Allusion since Nolan Gould is a member of Mensa, skipped 6 grades, and graduated from high school at the age of 13.
Deadpan Snarker: Just like the first character that made Ed O'Neill famous: Al Bundy (though Jay isn't as sarcastic as Al was. Probably because he's not married to someone as irritating as Peg and, Jay is much more successful in life than Al was.)
Hidden Depths: At first he seems like your stereotypical good ol' boy - loves football and lots of macho. But over the seasons, it's revealed he's more of a pragmatic intellectual and shows interests in astronomy, history, model building, and foreign culture among other things. Though the latter one should be self-evident given who he's married to.
Also, while it may seem that he is with Gloria for her looks, it is very quickly revealed that while he's attracted to her physically, it is most definitely her personality that he is interested in.
His relationship with Cam is equally deep - he seems pretty comfortable confiding things he literally will not tell anyone else with Cam.
Adorably Precocious Child: Though admittedly the "precocious" part does bother the adults and doesn't earn him a ton of friends.
Big Brother Instinct: Lectures his parents on not arguing will cause harm to Joe, when Gloria is still pregnant with him. After Joe is born, Manny didn't like how Claire was drinking while watching his baby brother and stated as such.
Creepy Uncle: Sort of. He had a crush on Haley, who is technically his niece. Of course, they're only related by marriage, close to the same age, and did not grow up together so how creepy Manny is will vary. It's also largely worn off as Manny's expressed interest in many other girls.
Daddy Issues: A recurring conflict between Jay and Mitchell is that Jay was never one to be openly affectionate during Mitchell's childhood, which made Mitchell's coming-out particularly uncomfortable.
House Husband: Tries being one for a few episodes after quitting his original job to spend more time with Lily, during which time Cam goes back to work. Subverted in that it turns out they both hate this arrangement, and he gets a new job very quickly.
Momma's Boy: Tends to get along marginally better with his mom.
Neat Freak: Exploited. Cam sometimes leaves the house a mess (not cleaning it up), and knows that Mitchell will feel like he needs to clean it and will do so.
Sensitive Guy and Manly Man: Depends. Mitch is the Manly Man because he's more Straight Gay and is the "stricter" father. However, he could be the Sensitive Guy due to him not being not as skilled in "manly things" like Cam is.
Straight Gay: More than Cameron, at least, although he isn't particularly masculine either.
Action Dad: Despite Cameron being overly dramatic and somewhat effeminate, when he thinks there's a stranger in Baby Lily's room he jumps out of bed, grabs a baseball bat, and charges in with a Pre Ass Kicking One Liner.
Badass Gay: In one episode, when he thought there was a stranger in Lily's room, he jumped out of bed, grabbed a bat, said "It's go time" with a Serious Business look on his face, and charged in ready to KILL whoever was in there (fortunately, no one was). In another episode, when Mitch almost gets into a fight with a rude Jerkass biker at a gas station, Cam gets out of the car and tells the biker he will "slam [his] head into that bumper so hard the airbag will deploy" if he didn't apologize. The biker apologized with genuine fear in his eyes. (Also, Cam was dressed up as Fizbo the clown during this scene, which just makes it more awesome somehow.)
Breakout Character: Cameron is the most popular character in the show. The fans just can't get enough of him.
Cleans Up Nicely: For all the jokes about his weight, it's acknowledged in-universe in Season 4 (by Jay, no less!) that Cam looks great after he rejoins his gym and finds the confidence to start wearing fitted suits.
House Husband: Has been one for most of the series' run, although he was a music teacher before adopting Lily, a job which he eventually returns to (this time at Luke and Manny's school) once she starts kindergarten. He also briefly worked in a greeting card shop while Mitchell was unemployed.
Sensitive Guy and Manly Man: Depends. Cam is the Sensitive Guy because he's been described as being more "momish" and he does tend to spoil Lily. However he could be the Manly Man because he does have more skill in "manly" things than Mitchell.
Screams Like a Little Girl: Generally when Lily is in trouble. He is actually mistaken for Mitchell's panicking wife on the phone when Lily is trapped in a car.
Hidden Depths: Despite Lily's catty attitude, she has shown to be a lot more selfless than what one may think.
Jerk Ass: Has become incredibly blunt and/or catty as she gets older. Though one episode suggests she gets at least some of it from Claire and likely, Jay who is particularly close to his granddaughter and vice versa.
A lot of it could also be that she is still very young and may not understand what things are rude to say to someone directly.
Karma Houdini: Although she's generally a pretty well-behaved and non-destructive kid (particularly for a 5-year-old who is obviously spoiled), Lily gets away with a lot of snark and disrespectful attitude towards adults. Part of this is that her dads are of the hyper-progressive coddling variety, and the other part is that her pinpoint snark accuracy and timing is so impressive most of the time that the adults are left speechless in her wake.
Like A Daughter To Me: Gloria considers Lily to be her daughter' she's even Lily's godmother and the one who Lily's dads turn to when Lily has questions about "girly things" that her fathers are a bit embarrassed to answer.
Only Sane Man: Even though she's much younger, Lily appears to realize how insane everyone else in her adopted extended family is.
The Other Darrin: Originally played by infant twins, by the end of season two it became clear that they didn't like the job and were replaced the next season by Aubrey Anderson-Emmons.