Ideas
Vines. Nature/Earth/Life. A moment when a person falls asleep, and ends up covered in vines or something. Dangerous, usually can control it.
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Best friends that do fluffy in-a-relationship stuff, and everyone ships them, though they aren't in a relationship and are completely content with that. In a grey area/ elevated friendship, as I like to call it.
(I'll elaborate more on this one another time, I'm really passionate about it...)
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Awesome super human fighter who uses music to determine how they fight (the beat, pace, lyrics, tone, etc., etc.,...). Preferably with awesome colored hair that can change based on emotions.
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A kid commits suicide and makes their bully go crazy and break down crying in the bathroom. Feel really guilty and think it's their fault.
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Insane girl at school who looks harmless, never stops smiling, skips around, twirls and dances. Always cheerful. Talks to people who aren't there, talks about strange things, attracted to sharp edges. If in a strange fictional school, always carries around knives and sharp objects, sometimes scissors. Collects them. Can fight amazingly well with them, twirling around with childish giggles and precision.
(Mashup of Harley Quinn, Luna Lovegood, and some random child who is very feminine - girly, you could say, though that term is stereotypical - I'm realizing. Sorry!)
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Someone with strange power: automatically neutralizes the emotions of anyone near them, and can easily influence and calm down people with their words. This person is thankfully a sweet pacifist, so doesn't abuse power and force people to obey, except when playing around. She is always very sorry to unintentionally manipulate people's emotions against their will.
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Sibling relationship where the first thing one says to the other in the story is "Leave me alone for once!" And then the last thing the same person says to the other in the story is "Don't leave me alone ever again." In some emotional moment. Only real hysterical fans of the story will notice.
Note - I have used modified versions of some of these ideas in previous chapters/parts.