Appearance and Personality
Haley is young, pretty and attractive. She is of average height and is very maverick and rebellious, constantly going against her parents one way or another.
At some point in time, she comes off to be a bit promiscuous and sexual. In "Virgin Territory," Alex accidentally reveals to Phil that Haley has lost her virginity. Phil then asks Claire about this and she then admits that she knew this, as she got it out of Dylan. She is newly legal to have sex with older men, which is proved in "Party Crasher" when she dates a much older guy who would constantly touch her legs and tell dirty jokes, much to Phil and Claire's annoyance. Then in "Flip Flop" , she is seen drinking in front of her parents, then drinks it too fast before a toast and says it is bad luck to toast with an empty glass. At the end "spring break" (season six), Haley is hinted to have put alcohol into her drink, as she accidentally gives her drink to Alex then Alex tastes something weird in her drink.
Haley is shown to gradually mature as the series progresses, learning to take responsibility for her actions and future, taking care of her parents and siblings, and unexpectedly revealing moments of wisdom and uncommon prescience. Even so, she takes pleasure in using her shrewdness to ocasionally take advantage of her parents and people around her for her benefit.
Haley was conceived before her parents got married (as revealed in "Hawaii", her parents had to suspend their honeymoon to Hawaii because Claire got pregnant with Haley). This led to their elopement and telling everyone that the pregnancy was a surprise. It was explained that Haley was very close with her mother when she was younger, but they grew apart once she hit adolescence. She constantly bickers with her parents and younger siblings, but does show to generally love and care about her whole family.
Haley is described by Claire in the "Pilot" as being very much like her when she was a teenager. So she tries to makes sure that her daughter won't make the same mistakes. Haley starts dating Dylan during the first episode, but it is revealed later on that she hasn't been single since she was 9. She is concerned about her popularity at school which she attributes to her embarrassment of her parents. She is learning to drive and isn't very good (she once refused to pull over when being signed by a police car because she was afraid of cops), but later improved and got her license. She and Dylan have an off-again on-again relationship as they do for most of the show.
Dylan wins Haley back after performing a song outside her house on Valentine's Day. Haley tells her family that she does not want to go to college because she believes it's a waste of time. But she later explains to Alex that she's scared about leaving high school since she's barely passing the 11th grade.
While vacationing with the family in Wyoming, Dylan proposes to Haley in front of her entire family. Claire immediately says no for her, causing tension in their relationship since Haley believes that her mother won't let her make her own decisions. Dylan ends up going missing, but he's later found after getting a job as a ranch hand. So they break up once again. She is afraid that she won't be accepted into a college, but she is wait-listed by a college at the end of "Election Day". After months of waiting and finally accepting that she won't be accepted into a college, she decides to move in with Dylan after she graduates. Luke confesses though that he hid her acceptance letter (along with a lot of other mail) because he doesn't want her to go. After finding out that she is in fact going to college, she and Dylan decide to go to prom.
Haley finally goes to the college as shown in "Schooled". But a few episodes later, she goes off to college only to be kicked out for underage drinking and (accidental) battery of a police officer. She then moves back in with her family and starts having to deal with the pressure from her parents to attend community college, go to work and get her life together in general before she is able to re-apply at the college next semester.
Haley is living back with her parents and attending community college. In "Three Dinners" she is pressured by her parents who do not believe she has any future plans or aspirations, but she proves them wrong by revealing her interest in fashion photography, and the blog she is keeping to earn extra money. In "ISpy", her work is featured in a photography exhibition (one of only five in her class chosen) and one of her photographs is sold. In one of the latest episodes, Haley's view on dating and men is changed when she is used by Phil and Andy as a proxy for his girlfriend. As he recites a passionate poem that he wrote for his long-distance girlfriend explaining that he loves her beyond compare and that he will spend his life trying to be worthy of her. Whilst in his arms, she looks into his eyes and begins to show signs of compassion for him, and even beginning to feel attraction towards him, but when he puts her down she acts as if she did not enjoy the experience. The season ends with Haley continuing to live at home and explore her fashion interests.
Haley is still living in the basement of the Dunphy house. She is now in her 20's and works for Gavin Sinclair as a fashion designer. She also begins having feelings for Andy the manny. In Connection Lost, Claire is in an airport heading back to home, but Haley doesn't answer her phone. Clare finally logs in on her fake Facebook profile and finds out that Haley is in Vegas and she got married. At the same time Alex and Phil got a book from postman and it´s about "What to Expect When You're Expecting". Finally it was revealed that Haley was at home all the time.
Alex is Haley's younger sister, she also happens to be her polar opposite. While Alex is smart, quick witted, and geeky, Haley is popular, outgoing and shallow. At the beginning of the series Haley and Alex had a much more strained relationship with Alex always trying to stand apart from her sister and Haley constantly mocking Alex on her life choices, such as clothing, homework, boys and Alex would return the mocking. As years have progressed the two girls have grown closer. Haley and Alex once convinced Luke that he was adopted, and Phil's old girlfriend wanted to take him home. Though they still mock and tease each other, it is in a more playful way and you know that they love and care about each other.
Dylan is Haley's on-and-off boyfriend.
David starts out as Haley's tutor, but winds up her boyfriend until we see Dylan again in Bixby's Back , trying to win her back.
In "Dude Ranch", Dylan got a job at the ranch which means Haley and him won't be seeing each other for a long time.
In "Disneyland", they get back together again due to them encountering Dylan in Disneyland. Post Disneyland Dylan works as a limo driver, during which time he has contact with Haley. Although they don't seem exclusive, he seems to be the only consistent guy who Haley dates.
Ethan is a boy Claire invites to go to Disneyland in "Disneyland" with the family because she wants Haley to fall for him and completely get over Dylan, who had moved to Wyoming in "Dude Ranch". Haley, adamant that she wasn't going to babysit him, quickly changes her opinion after meeting him, much to Claire's delight. Much to Claire's chagrin, Dylan shows up at Disneyland completely unannounced. He rushes off after running into them, and Haley realizes that she still likes Dylan. So she ditches Ethan, leaving Alex with Ethan, another thing that Claire did not like. After seeing Dylan as a 'Dapper Dan', Haley ditches Dylan and begins talking to Ethan again, bumping Alex out the way. After some time, Dylan meets up with Ethan and Haley again in his Little John costume declaring his love for Haley. Ethan and Dylan get into a minor scuffle. At the end of the day, Haley eventually dumps Ethan, Ethan leaves with someone he ran into, and Haley and Dylan get back together.
Vincent, though we never see him, is mentioned in season 6. He is apparently an ex-con who works at a florist shop. She intentionally did not tell her parents about him because she knew they wouldn't approve of her dating an ex-con.
Kenny is a temporary love interest seen in Party Crasher and is quite a bit older than her. When Phil first meets Kenny he doesn't realize they are going on a date. When Haley learns how disgusting he is, she quickly abandons the relationship.
Haley and Andy, Joe Pritchett's "manny", initially despised each other. Andy disliked Haley's insouciant attitude and her blithe disregard for his authority. Haley disliked Andy's bossiness and felt like he was intruding on her space. (The Help) Over the course of a few episodes, however, she begins to develop feelings for him. However, she backs off when Alex tells her to consider the impact she might have on him if she continues to toy with his feelings. (The Wedding (Part 2)) Although she lets him go during Mitchell and Cam's wedding, they share a kiss during their next meeting and Haley's feelings for Andy floods back into her. (The Cold)
Haley and Andy are shown to share a close and friendly relationship throughout season 6, although Haley quietly encourages Andy to chase after her while he pretends to lie unconscious on a hospital bed. (Closet? You'll Love It!) The season finale ends with Andy preparing to propose to his girlfriend while Haley and Andy seperately admit their feelings for the other to Phil Dunphy. (American Skyper)