Lily is the main character of The Crazy Twins Series. She is the twin sister of Colin, or as Colin likes to say, Colin's little sister. Colin is one hour older than Lily, which makes the timing of him being born one day ahead. Lily is in 2nd grade and is always trying to get Colin out of her troubles. She is always ready to go on an adventure and never backs up from a challenge. She also loves solving mysteries and puzzles. She and her brother along with their friends can make random things into a big fun and surprising story.

Colin is a 2nd grade boy who loves playing video games, especially Minecraft. He likes to get Lily in trouble, but tries to act very nicely when grown-ups are in the room. He loves to tell everyone that he is older than Lily. He likes doing sports, such as soccer. Colin is serious about birthdays, and can be very funny and loud.