According to Corey, the band can't come up with any good lyrics when they do a gig, so they use entries from Trina's Diary as a source of lyrics for their songs. However in order for Trina to write something in her Diary she must go into Diary Mode in which she must be in a extremely emotional phase (mostly anger) where she would jump into the air while either heavy metal, sad or happy song plays and while she write in the diary strange phenomenon happen. When she writes, either red or green flames, storm clouds or hearts appear. After she write in her Diary and get back on the ground, looking all tired and the band would use that she wrote as a lyrics.
List of episodes where Diary Mode take place
Trina goes into Diary Mode when she saw Nick (who was a zombie at the time) being attractive to Mina, who was dressed like a huge brain. Unlike all of the other episodes, nothing was revolving around her.
Trina goes Diary Mode only this time it was love instead of rage because she thought she kissed Nick even though it was on his ear and not his lips because he turned his head just before their lips touched. She got Nicken pox and had red spots with Nick's face all over her's. Later in the episode she figured out it was on his ear and not the lips but didn't go into her normal diary mode. Love music was playing, the background was pink, and hearts were surrounding her.
Trina goes into Diary Mode after Corey and Grojband used her fear of puppets on her after ruined their mechanical puppets. This time it was slightly changed because it was fear and not rage so her eyes had a scared look instead of a mad look and when she was writing in her diary it was green creepy ghostly fire instead of normal fire. The things spinning around her were broken parts of puppets.
Trina goes into Diary Mode after Corey and Grojband attached her beloved childhood toy on their car during a race. The stuff that was surrounding her was traffic cones and tires.
Trina goes into Diary Mode after she was revealed to be a nerd after losing "Try-Math-athon" to Kon. The stuff surrounding her were numbers and mathematical symbols.
Trina goes into Crazy Diary Mode after the Space Orbs (while taking over The Newmans bodies) revealed that Trina believed Nick would like Mina than her from her diary. The stuff that was surrounding her was corn.
Trina goes into Diary Mode with a pig's face after Corey tricked her into wishing she and him wasn't related when she used her first wish for "Her Brother and his band not to play any more". The stuff that was surrounding her was jugs.
Trina goes into Diary Mode: Sad after learning that her favorite pink sweater, Pink-credible, had moved on and chose Laney over her. When she was writing in her diary, storm clouds were forming on the places she was writing instead of fire. Little Pink-credibles were surrounding her. Different music was playing, instead of her normal screaming in rage music, it was a creepy widower choir. The background was blue and not red.
Trina goes into Diary Mode after winning a raffle and won the world largest diamond shaped chocolate. This time it wasn't rage like it usually is it was love just like in the episode "Pox N Roll".
Trina goes into Diary Mode after seeing the sewer monster on a date with Nick. Poisonous skulls were spinning around her.
Trina goes into Diary Mode when she learned that Corey and his band destroyed her project and might have to take the same class again, meaning she would have to be in the same grade as Corey and wouldn't be in the same grade as Nick and Mina would be away from her and with Nick.
Trina goes into Diary Mode after Blade Stabbington ruined her chance to get a real kiss from Nick and he motored off Mina.
Trina goes into Diary Mode after she was put in a cage after being mistaken for a unicorn.
For the entire episode Corey and Grojband tried to get Trina to go into Diary Mode in order use what she wrote for lyrics. However, Trina somehow was able to not go into Diary Mode because she want Nick to like her and the band had to do everything in their power to get her into Diary Mode. Later she got into Diary Mode when she learned that Nick and her will face each other in the "Final Death Round" of the Demolition Derby.
Like before, for the entire episode, Corey and Grojband tried to get Trina to go into Diary Mode in order to use what she wrote for lyrics for the coronation of the Queen Bee, in which they also had Trina compete and while their original plan was to have her go into Love Diary Mode, she instead goes into Diary Mode and also used it to control the bees and was crowned Queen Bee.
Trina goes into Diary Mode after Corey and Grojband (while dressed like superheroes) foiled her plan to prove to the town that The Justice Band are not superheroes, by saving both Mina, and herself.
For the first time ever instead of Trina, Mina goes into Diary Mode after she was told by Corey that once the comet (which allowed her make Trina her troll instead of the other way around) is gone she'll go back to being Trina's troll.
Trina goes into Diary Mode after learning that the prize winning dog, which gave her a kiss, was really Kon.
Trina goes into Diary Mode after Corey kicked Nick Mallory off a plank.
Trina goes into Diary Mode after she finally was able to link with Nick's mind.
Trina goes Diary mode when she learn that she, Nick and Mina will be trapped in an Elevator forever and listing to Grojband music.
Trina goes into Diary Mode when she yells out at the Nick Mallory bobblehead that he CAN'T say no to him.
Trina goes into Diary Mode when the old ladies dress her up like an old lady in front of Nick Mallory and she misses the good old days.
Trina goes into Diary Mode when she finds out that she's not special because everyone and everything else is special/
Trina goes into Diary Mode with a cheerleader's outfit on when she finds out that Grojband won the snow competition.
Trina goes into Diary Mode when she hugs Nick Mallory. This time she went into Love Diary Mode again just like she did in "Pox N Roll", "Helmet", and "Ahead of our own Tone" (Ahead of our own Tone was In a futuristic way with a purple background and futuristic music and pixel hearts and 1s and 0s and she was a cyborg) This is the first time she went into Love Diary Mode when there wasn't any other tweaks to it. (In Pox N Roll she had chicken pox, in helmet she stuck her tongue out, and I already said what happened in Ahead of our own Tone.)
It is unknown what Trina did in Diary Mode in this episode because it hasn't been uploaded on YouTube yet for some reason.
Trina goes into Diary Mode when she holds hands with Nick and he has bread for a head and she's allergic to bread.
Trina goes into Love Diary Mode again when she sees Nick Mallory come to the coffee shop. She was trying not to go into Love Diary Mode because she wanted to be a hipster but she did. She went into Love Diary Mode in the episode Pox N Roll, Helmet, War and Peaceville, and Ahead of our own Tone in a future way.
Trina goes into Diary Mode when she thinks she's gunna spend the rest of her life with Nick Mallory but she finds out she's actually gunna spend the rest of her life with Corey.
- It would seem odd that Trina, who is the series main antagonist, would help with her brother's band. Although she does not intend to do this and she is unaware of the fact that their lyrics come from her diary because the band knows to change them around alot so that she doesn't figure it out. If she knew those were her lyrics, she would stop going into diary mode because she knew that was helping them. The Space Orbs on the other hand didn't know how to change the words so she found out it was her diary.
- Part 1 of The Dreamreaver is the only episode that she doesn't go Diary Mode. She goes diary mode on Dreamreaver pt. 2
- Mina, after going into Diary Mode, confirm that by going into Diary Mode makes it look so overdramatic.
- Depending on the events and environment around her Trina's Diary Mode 'writing fire' changes. (Ex: Clouds; hearts; green fire; more to come)
- Corey usually gets her diary after Trina goes into Diary Mode. But in the episode 'Six Strings Of Evil', Laney gets her diary.
- The idea for diary mode was to have a Sailor Moon-esque scene that could be reused in every episode but tweaked when needed. 
- This is similar to the Death Note.
- This has many aliases, such as "Diary Freak-Outs" and "Going all Diary"