The Generic Guy: Whilst the other characters all have their quirks, Jake is really just there to give Lucas an ally on the basketball team & serve as a Romantic False Lead for Peyton, with no real characterization beyond the fact that he's a nice guy who happens to have a daughter.
Demoted to Extra: Whilst never prominent characters, Junk and Fergie was given stuff to do during Seasons 1 & 2. By Season 9, he had been reduced to background character.
Flat Character: They have no real role in the story. They are just...there. Save for a random episode in Season 7 where they babysit Jamie, and their frequent appearances on Mouth and Skills' couch playing video games, what real contribution did they have to the show? This is ultimately lampshaded during the cast of the movie adaptation of Lucas' book, as it's revealed that in order to streamline the cast for the film, Junk & Fergie's characters have been cut.
Girlfriend in Canada: Junk claims to have one in response to Skills' "Four years of high school. Zero girlfriends for Junk and Fergie" comment in the fourth season finale.
Hidden Depths: Junk calls a crisis hotline during season 8, and admits that he's displeased with his life due to it seemingly going nowhere.
Only Known by Their Nickname: No one ever calls Junk by his real name, John. Fergie is called "Ferguson" twice during the course of the show - once whilst teasing Lucas over forgetting his roots after not coming down to the River Court for a while, and when his name is called out during graduation.
Those Two Guys: Almost always appear together. In the Season 4 finale, there's a shot of the 12 graduating seniors paired up - Lucas & Peyton, Nathan & Haley, Brooke & Chase, Rachel & Mouth, Bevin & Skills, and... Junk & Fergie. Likewise, at Lucas & Peyton's wedding, there's a brief series of shots showing the various couples who aren't married; namely Mia & Chase, Mouth & Millie, Skills & Lauren, and again, Junk & Fergie.
A Death in the Limelight: Jimmy only appears in two episodes before season 3...And then there's "With Tired Eyes, Tired Minds, Tired Souls, We Slept", hands down the most tragic and tear-jerking episode of the entire show. Out of all people who died during the show, Jimmy's death is probably the most shocking one (tied with Keith's death, from the same episode).
All of the Other Reindeer: With terrible and tragic consequences. The reasons why Jimmy starts hating school, feeling ignored by everyone, even Mouth and his other close friends.
Chekhov's Gunman: Disappearing after the first two episodes in season 1, he made a huge impact to the show's story upon his return in season 3. As an actual guman, no less.
Chuck Cunningham Syndrome: Disappears without explanation after the first two episodes. Deconstructed in season 3, as Jimmy became very bitter over being abandonned by his friends from the River Court, and began hating the entirity of the Tree Hill High student body because they didn't notice when he accidentally overdosed & was missing from school for several weeks.
Driven to Suicide: Upon seeing the unconcious & bleeding out Peyton, Jimmy loses all hope that things could get better & puts his gun to his chest before pulling the trigger.
Forgotten Fallen Friend: Averted, After his death in Episode 3x16, Jimmy is referred to repeatedly over the following six seasons, his death greatly affecting Mouth.
Mistaken for Murderer: After his death, nonetheless. As seen below, everyone thought Jimmy killed Keith, before committing suicide.
Small Role, Big Impact: Only appears in four episodes, but saying he has a big impact on the show is an understatement. After his death, he's still repeatedly mentioned by Mouth or other characters even in later seasons.
Sympathetic Murderer: Not really. But after the school shooting he was considered this way by most people when they still didn't know that Dan, not Jimmy, was the one who killed Keith.
Took a Level in Cynic: It's easy to distinguish this if you compare his appearances in seasons 1 and his character in season 3.
Disappeared Dad: Due to his work as a fisherman, Larry spends a large chunk of his time at sea & away from Peyton.
Long Bus Trip: Doesn't appear at all during the second season, and isn't seen again after the third season - despite his daughter suffering from PTSD after being stalked by Psycho!Derek, graduating from high school, getting married, having a daughter & nearly dying in the birth, even though Larry's job as captain of a dredging vessel means he could have popped back up at any time.
Papa Wolf: To Peyton, largely due to work meaning he's away for large periods of time & the death of his wife when Peyton was a little girl.
Reasonable Authority Figure: Trusts his teenaged daughter to take of herself whilst he's away at sea, and allows Brooke to move in during season 3.
Shipper on Deck: During the first season, he's very much aware of his daughter's attraction to Lucas, and at one point invites him to join them whilst he was having dinner with Peyton at Karen's Cafe, even justifying his actions as "Taking care of my little girl."
Ascended Extra: If you look closely in Season 1, you can see Bevin in various scenes as an unnamed extra.
Back for the Finale: Having not appeared since Season 5, she returns in the Grand Finale working in the Courthouse when Clay & Quinn go to sign the adoption papers for Logan. She also appears after the final Time Skip, the show implying that she's reunited with Skills.
Better as Friends: With Lucas, they dated for a while, but he broke up with her to be with Brooke. She was mad at him for a while, but they patched up and remained friends. He even became the first person she confessed to being Bi about.
Coming-Out Story: When she discovers that Felix wrote dyke on Peyton's locker she turns him in getting him expelled. She comes out to him and states how hurt she is by his use of the word.
Gayngst: Suffers through this for most of her appearance, mostly due to her family's disapproval, especially her brother Felix. She eventually comes to terms with it.
Put on a Bus: In Episode 2x18, "The Lonesome Road" she comes back to her old school.
Played with. She is the girl Nathan lost his virginity to. Nathan is of course married to Haley and Taylor crashes at their house at a delicate point in their marriage, and flirts with Nathan a lot during it. In the end, she helped Nathan realize he still loved her after Haley left to go on a tour.
When she returned in season 7, she is seen dating Quinn's ex-husband David.
The Tease: Acts like this constantly, flirting with Nathan during her stay at his and Haley house and wrote "Lucas - you know you want me" in his Freshmen yearbook.
Cool Uncle: Because he was roughly 12 when he became an Uncle, his relationship with Nathan comes off more like an older brother & significantly younger brother. He even makes an effort to have a relationship with Lucas, who actually isn't related to him in any way.
Sexy Shirt Switch: After getting drunk and puking all over herself, she wakes up the next morning wearing Mouth's shirt. Gigi teases him about it the morning after and Millie immediately assumes this trope happened when she catches her wearing it.
Shameless Fanservice Girl: When returning Mouth's shirt she takes it off right in front of him, revealing she's not wearing anything underneath.
Darker and Edgier: Is first introduced during the school shooting, as just a normal girl. When she reappears in season 4, she's become a goth.
I Resemble That Remark!: When Peyton protests that she's a loner & not a prom queen during a Social Studies class, Glenda points that she's a loner whilst Peyton's a cheerleader dating one of the stars of the basketball team.
Not So Different: After spending an hour with Lucas, she admits that he would've made a pretty good goth.
Freudian Excuse: He felt guilty and was very devastated for his girlfriend's death when they were both involved in a car accident. He was obsessed with Peyton because she apparently was very similar to Maggie, his dead girlfriend.
Made of Iron: During his first Attempted Rape of Peyton, he manages to subdue Lucas and the real Derek (An actual member of the Marine Corps.) in short order, before the two of them throw him through Peyton's first-floor bedroom window. And he still manages to recover enough that he's able to flee before the police arrive.
Never My Fault: He fails to acknowledge that he's in prison because of what he had done to Peyton and her friends. Instead, he blames her and claims that she's nothing more than a tease with everything she does.
Insistent Terminology: Argues that Jamie has to call her Aunt Lilynote Technically, she's not his aunt anyway - whilst Lucas & Nathan are half-brothers, she's only Nathan's cousin & subsequently isn't Jamie's aunt.
Meaningful Name: Is named Lily after Keith's spirit visits Karen in her coma, and a spirit version of their daughter is happily playing in a bed of lillies.