Katie Keller

Katherine "Katie" Keller is a graduate of Tree Hill High School, a major protagonist and a former main character in the series. She, unlike her sister Brooke, doesn't care about being popular in school and decides to make her own impact. However, like Brooke, she is very determined to create a legacy on the world that will give her family a better life.

Katie's need to help people stems from her mother's abandonment when she and Brooke were younger as she doesn't want anyone to go through the same thing she went through. But after it is revealed that her mother is Taylor James, she begins to show a darker side to personality realizing that her mother was here the entire time. She separated herself from everything that made her feel normal and good, with Chris seeking her severe medical attention.

Her life changed, however, when she was diagnosed with a mental disorder. Her inability to cope with the disorder almost lead her to suicide but her then boyfriend Jeremy helped her through and made her stronger. Continuing their relationship helped her see that she wanted more out of life so she decided to give him space. Her OCD diagnosis made her skeptical about her actions and whether or not she had control over them, so she started taking pills.

She is best friends with Lauren Taylor, former enemy Lily Scott, Kelsey Evans, Lydia Scott and her ex-husband Jeremy Jagielski. She is close friends with Milo Adams, Ariel Moore She is friends with Sawyer Scott, Logan Evans, Haley Baker, Elliot McFadden, Jamie Scott She is enemies with Nina Scott, Melissa Adams, Jenny Jagielski, Victoria Crawford,

Character History
Season 1

In Pilot, Katie is seen alongside her father Chris and her sister Brooke walking into the reunion, despite their father not attending the school. She walks away and approaches her friends Lydia and Nina, who then ask her how she feels about school starting tomorrow. She tells them that she's excited to start a new year as she wants to be apart of the yearbook committee. She is seen last seen walking out the reunion with Brooke and Chris, the former being a little buzzed and the latter being oblivious, making her smile.

In Checkmate, Katie is shown at the her house with Chuck, Milo, and Melissa complaining about their fathers' attempts to make them bond. She tells them to watch where they put their stuff as Brooke is going to be pissed. Chuck tells her that she's going to have a fun time in school with a sister like Brooke as she tells him to shut up. She is seen looking on as they leave their house in a fury to get to school.

Trivia

 * Counting only The Next Generation, Katie is one of fifteen characters to appear in over 200 episode or more.
 * The others are Logan Evans, Sawyer Scott, Brooke Keller, Elliot McFadden, Haley Baker, Jackson Scott, Jamie Scott, Kelsey Evans, Andy Taylor, Matthew Baker, Elizabeth Scott, Amber Swift, Lydia Scott, and Chuck Scolnik.
 * Katie was a member of the Yearbook Committee until she left due to her deepening depression.
 * She is one of 4 characters to have a secret relative, as her mother is revealed to be Taylor James.
 * The other are Ben Chambers, who's parents are Lucas Scott and Brooke Baker, Maya Hall, who's grandfather is revealed to be Whitey Durham, and Debby Marsh, who is revealed to the daughter of Mouth McFadden.
 * She is the only character to
 * Katie is the first character
 * Her change in attitude was a turning point for the character and met with critical acclaim.
 * She is
 * Katie's role in the series significantly increased after
 * She has a very well known Type A personality.
 * Katie is one of the characters to become addicted to drugs/pills.
 * The others are Brooke Keller, Andy Taylor, Chuck Scolnik, Maya Hall, Miley Batter, Kirk Carson, Jasper Cunningham, Serena Baker, Jeremy Jagielski, Victoria Crawford, Kevin Hargrove,
 * Counting only the Next Generation, Katie is the 10th female character with the most development.
 * She follows Sawyer Scott, Brooke Keller, Madison Landry, Haley Baker, Kelsey Evans, Amber Swift, Debby Marsh, Ariel Moore, and Octavia Hargrove.
 * Counting only the Next Generation, Katie is the 10th female character with the most development.
 * She follows Sawyer Scott, Brooke Keller, Madison Landry, Haley Baker, Kelsey Evans, Amber Swift, Debby Marsh, Ariel Moore, and Octavia Hargrove.
 * She follows Sawyer Scott, Brooke Keller, Madison Landry, Haley Baker, Kelsey Evans, Amber Swift, Debby Marsh, Ariel Moore, and Octavia Hargrove.