Fist chapter. Yay. So this is a whole heap of great headcannon ItTicklesLikeCrazy pm'ed me so I thought I'd put it all up in this chapter. I would have put it up sooner but I got locked out of my account for no reason.
Dani didn't get all of Danny's knowledge, but she does have a strange shift that can help her learn faster until it's convenient for her to stop
Danny may or may not be strong enough to focus his energy and remain in ghost form when he passes out, it depending on the battle is your excuse, but it really is just if it needs to happen in the story.
Amity Park is now a hotspot for natural portals and it is much easier to "rip" a portal to their because of the direct fusion with the Ghost Zone that happened when Danny made the portal work. This doesn't occur in Wisconsin, where Vlad's accident happened, but it does explain why Danny doesn't just shut the Fenton Portal down.
Every ghost has a lair in the Ghost Zone. It's possible for Danny and Plasmius to have theirs, but since nobody cares enough to show them where they are, in most stories they don't.
Danny is LEGENDARY all over the ghost zone (especially the lesser-known parts, where his enemies aren't) because of the Pariah Dark incident and the fact that he's a halfa. Some ghosts can just be tourists, and Danny has to go ghost to deal with tourist ghosts who are absolutely thrilled that the Danny Phantoms legend is true.
Danny has an insane hero complex (this is already stated on the show.).
Sometimes I assume that occasionally (which can be anywhere from almost never to almost always) natural portals open up in different locations other than Amity Park and Danny goes and saves the people there too. This cuts even more into his life, but he won't give it up. The natural portals can be anywhere from Paris to China to the next town over.
Danny may or may not be known all over the world as a famous ghost, and has raging fangirls on every continent. I especially liked the small joke from Wings of Morphius saying that his picture was banned in China, but girls still smuggled it into their rooms anyway.
Most citizens of Amity Park consider Danny a hero, but this excluded Danny's parents and Valerie, though Valerie's father may or may not.
I have calculated it and I'm most assuredly not wrong (most likely). "Phantom Planet" (PP) happened at the very beginning of Danny's sophomore year. However, "D-Stabilized" happened at the end of the summer that began in "Reality Trip". "Mystery Meat" happened one to three months into Freshman Year.
Credit to ItTicklesLikeCrazy (again) for this chapter. It'd be great to base some stories off some of this. Also I think the timeline being figured out is awesome. Remember you can review or pm me headcannon and I'll put it up in the next chapter.