Lily Aldrin (Alyson Hannigan) is the wife of Marshall Eriksen (Jason Segel) and a schoolteacher on the television series, "How I Met Your Mother." She is also close friends with Ted Mosby (Josh Radnor) and Barney Stinson (Neil Patrick Harris), and best friends with Robin Scherbatsky (Cobie Smulders). Lily grew up in New York and abhors the idea of living anywhere else, even some place close like New Jersey. She loves shopping for clothes and has a very extensive wardrobe of fashionable clothes.
Lily met Marshall in college at Wesleyan. They lived down the hall from each other in their dorm, happened to bump into each other one day and felt instant attraction. Ted was Marshall's roommate at the time and found the couple to initially be rather annoying.
After several years together living in New York, Marshall proposed to Lily. Soon after the engagement, Lily decided she wanted to fulfill her passion for becoming an artist and signed up for art school in San Francisco. Marshall didn't want her to leave, but she did anyway and broke up with him before she left.
Lily's time in San Francisco was not pleasant. The art school teachers did not think she was very good and she had little money to live on. Barney showed up at her door one day and told her that she had to come back and be with Marshall because they were meant to be together. She returned to New York and to Marshall.
Unknown to Marshall, all of Lily's clothes were being purchased on credit cards which she was not paying back. She had a very large amount of debt. When Marshall was offered a choice between his dream job and a high paying job she subtly urged him to the high paying job because of her debt. She also didn't tell him about the debt before he tried to purchase a new apartment. He found out during the application process and was very upset. However, they did end up buying the new apartment.
After much discussion, Marshall and Lily decided to try and have a baby. With their financial situation settled and both set in their careers, they felt that they were ready.
"Intense? I have a wedding to plan in nine weeks for two hundred people! Even if a dinosaur should poke his head out of my butt and consume this coffee table, I need you to roll with it, okay?!"
"Wow, five years. If I had to go five years without sex, I'd be out in the streets selling it for a nickel."
"I'm going to give you a Lily Aldrin original, because you're such a good husband. I'm thinking of calling it, "Suck it!""
"Okay, I think we need to lay down some ground rules. Just because we can be loud, doesn't mean we have to be loud. And although it might turn you on, you screaming, 'I'M THE BEST!' doesn't do much for me."