Haley Dunphy, played by Sarah Hyland, is the eldest daughter of Phil and Claire Dunphy. She starts off as a fashionable, social, and somewhat rebellious teenager, more interested in popularity and boys than academics. However, as she grows older, she matures into a caring and independent young woman while still keeping her fun and spontaneous personality.

Haley is known for her quick wit, confidence, and occasional ditziness, often clashing with her nerdy sister, Alex, and teasing her younger brother, Luke. Despite her struggles to figure out her future, she eventually finds her passion in fashion and marketing, proving that she’s more than just a pretty face

Alex Dunphy, played by Ariel Winter, is the middle child of Phil and Claire Dunphy and the brains of the family. Highly intelligent, sarcastic, and ambitious, Alex is a straight-A student who often finds herself frustrated by the chaos and lack of intellect around her, especially from her older sister Haley and younger brother Luke.

Despite her sharp wit and no-nonsense attitude, Alex sometimes struggles with social interactions and the pressure of being the "perfect" student. Over time, she learns to balance her academic success with enjoying life and connecting more with her family.

Luke Dunphy, played by Nolan Gould, is the youngest child of Phil and Claire Dunphy. Playful, mischievous, and often clueless, Luke has a carefree and adventurous spirit, much like his dad, Phil. Though he’s not the most academically inclined, Luke surprises everyone with occasional bursts of intelligence and unexpected wisdom.

He loves pranks, inventing bizarre ideas, and getting into trouble, often teaming up with his best friend, Manny, despite their opposite personalities. As he grows older, Luke matures while still keeping his goofy charm.