FoxTrot/WMG

Jason (As well as Morton) wear glasses similar to Dave.
Both Jason's and Morton's glasses are opaque. Thus, both sets of glasses have H.U.D's in them. They are nerds, after all.

Not all glasses in the strip look like theirs. Phoebe's glasses are transparent. Thus, theirs are special.

Jason is an armoured-closet transgenderist.
Think about it; he's afraid of being seen interacting with girls to an extreme and impractical extent, even for a ten year old boy. But the real evidence comes from his dream sequences; one seems to suggest that, at some subconscious level, he has a repressed desire to be Lara Croft; another time, he dreamt that he turned into a girl and started to like it.
 * The Lara Croft thing was a result of his brother playing the game right before Jason went to bed, and the other was the result of reading Metamorphosis before bed. You read Kafka and not have a weird dream, I dare you.
 * Presumably, Andy's cuisine might not be complementary to having decent dreams if any odd influence is shown immediately prior to bed.

Jason is a Time Lord.
His TARDIS is the iFruit. That's why he's often on it, and also why Paige knew who was voted of "Survivor", Peter read the next day's "Doonesbury", and Jason downloaded the "Attack of the Clones" soundtrack 2 weeks early, all from the iFruit in one strip. Whenever the year ends, he travels back in time to the beginning of it, because he's comfortable being 10 and never wants to grow up, hence why no one ages. The reason many current events and movies occur in the strip is because Jason travels to the future to witness them. Oh, and the last panel of this strip wasn't imaginary- it was Jason traveling 11 or 21 years in the future to see his grown-up self.
 * Also, his love and knowledge of dinosaurs comes from having lived in the Jurassic during his first reincarnation.
 * In his second reincarnation, in the 1500's, he was Leonardo da Vinci and Marcus was King Cheops. That's why the snow dance they once did made it snow and closed school two days later.

Jason will eventually (like when he's an adult) travel to other Universes.
Whether this happens or not you have to admit it'd be pretty cool...especially if he ended up in Fallout.

Jason is Milo Bloom.
They are both skinny, short, nerds who wear glasses. They're both from popular Newspaper Comics, and they both have blond hair. Compare this with this.
 * Also, Marcus is Oliver. Not only are they both black nerds, they have the same last name: Jones.
 * The reason Milo was on a bus in the 2nd-to-last Outland strip was because he was moving to Illinois, setting up Foxtrot.
 * And the Banana Jr 4000 was an early version of the iFruit.

Jason and the Peanuts characters go to the same school.
Come on, the Peanuts characters HAVE been seen in Foxtrot on two occasions.
 * Eileen is The Little Red-Haired Girl. Get rid of the freckles, replace the Sphere Eyes with Black Bead Eyes, and you've got pretty much my mental image of her.
 * As for Marcus? Franklin, of course. Franklin is just his middle name. (He never was given a Canon last name, after all...)