Tomoko is autistic.
- She doesn't behave like a person with autism. More likely is she has Avoidant Personality Disorder
The series will end with Tomoko starting a manga based on her life.
- The author says some parts of the series come from old high school memories, so it makes sense.
The finale will be about her and some guy in serious danger of dying,
- So she'll try invoking Must Not Die a Virgin, then will turn out the guy is not a virgin at all, then she confesses her own virginity, awkwardness issues, but she'll get her wish anyway.
- Then she wakes up, turns out it was All Just a Dream or something, but hints are dropped that the life-threatening situation from the dream may happen soon in real-life, cut to black, the end.
Tomoko will never become popular while in high school...... but she will find happiness, friends and love at some later point in her life. The series will conclude with An Aesop that having no friends in high school isn't the end of the world, and that life can always get better.
Tomoko is foreign.
- Most likely European or American, given that she has green eyes, but she lives her life in Japan. Japan has a habit of xenophobia (especially since Japan isn't very culturally diverse, 98% of Japan's population is Japanese), and therefore the students could be excluding Tomoko because she's foreign. She grew more and more secluded because of the exclusion. When she started high school, she's had enough of being so introverted and tries her best to fit in, but because she's spent so long by herself, it isn't working.
- If this is true, it's likely that one of her grandparents on the foreign (most likely her father's, as her mother seems to be Japanese) side of her family is Holden Caulfield.
Tomoko will develop feelings for her brother.
- Tomoko seems to, ever so slowly, be getting closer to her brother. And has in the past thought that him looking at her strangely was an indication that he viewed her as more than just a sister. There will be at least one chapter where she believes herself to be in love with her brother, in that kind of way. Though knowing the manga, it will turn out to be something completely different before the chapter ends. Possibly a momentary lapse in sanity after her brother finally does something kind towards her. She seems to freak out towards anyone showing her even a little bit of kindness after all.
Tomoko is actually Haruhi Suzumiya.
- Because someone had to do this. Tomoko is what Haruhi would be if Haruhi never awakened/received her Reality Warper/GOD status.
Kyubey is stalking Tomoko.With that much desire within her, she'd make the perfect Magical Girl.
- In fact, she might have been the TV witch.
- Tomoko is a borderline shut-in, who cannot take normally around anyone except her family. The perfect victim for the NHK's machinations. The boy giving her an umbrella? The middle school kids she hangs around with? All ploys to give her a sense of hope, before it is brutally torn away from her. They'll stop at nothing to turn her into a NEET and a hikkikommori. Nothing, I say!
- Or maybe a mixture of mental issues and internalized misanthropy is keeping her from having friends. Whatever works.
Tomoko is Konata Izumi in an alternative universe.
- Because I can't be the only one who is reminded of a really messed up Konata when I see Tomoko.
Episode 12 of the anime...
- ... ended with Tomoko realizing that she is just an anime character, and being driven insane by this realization. This is why she became aware of the narration, and agreed with the narrator than her story doesn't matter.
Each secondary/background character is a protagonist of their own series.
- Tomoki is clearly more in the life of a sports series (friends, social life, afterschool sports), the students Tomoko sees daily are from a slice-of-life comedy (constantly talking and hanging out), and Imae is the protagonist of her own series; possibly a magical girl (popularity, friendly even to Tomoko). To each of them, Tomoko is a side character of their own series, hence why she never gets a high viewpoint from any of them but Imae who may want her to join her team or just be her friend.
The reason why Tomoki's grown cold toward his sister......is because she attempted to molest him in the past. With the things she's interested in and her desire to get laid, she may have tried resorting to rape at one point.
- Or tried to get him to "rape" her. We've seen Tomoko try to get Tomoki to play along with her scenarios, i.e. "wall-slamming" her, and she's displayed an inability to distinguish fantasy from reality, especially when at a low point. That plus Tomoko's tendency to ignore the effect she has on others, and the fact that Tomoki's the only guy she has real conversations with (plus the tendency of H-games to feature Brother-Sister Incest, blood-related or otherwise), could mean trouble.
Tomoko has genuine singing talent.
- The ending theme has Tomoko sing a tune with an uplifting tone. It tries to go with Stylistic Suck but frequently slips up, causing Tomoko to sound quite good. She's just a little rough around the edges unless she's starting to have an emotional breakdown, then it goes into the crapper but that's true for everyone. Of course the ending theme is obviously not part of the main story. Chekhov's Gun? Doesn't quite fit the definition. Foreshadowing? Yeah, that's more appropriate.
Near the end of the series, Tomoko will get exactly what she wants, and becomes popular....but later realises her newfound popularity is shallow, and that people don't love her for who she is, so she wishes to return to the honest friendships she had with Yuu and (possibly) Komiyama, the moral of the story being that it doesn't matter being popular as long as there's at least one person out there who considers you a true friend.
Tomoko recieved an Esoteric Happy Ending
- At the end of the series, she comments that her story doesn't matter and then laughs. She learned to laugh at her problems instead of taking them and herself so seriously, finding a certain humor in them. also, Tomoko's situation isnt completely hopeless; Though she didn't become popular, someone out there wants to "keep an eye on her".
- Showing how messed up you have to be in order to be into that.