Hey everyone! So these are some random Headcannons that I made up regarding Jason and Thalia. Some of them I've used in a story, some I havent. Feel free to write anything based off of Headcannons you see. :)

Headcannon #1- Sneezing Thunder:

Whenever Jason had a particularly bad cold, there would be a clap of thunder or a bolt of lightning whenever he sneezed. Once, he got Thalia sick, and with both of them sneezing, well... The power went out all over camp.

Special thanks to Tailsdoll13 for giving me the idea for the power outage in a review. Most of this came from my story, "Sneezing Rainbows".

Headcannon #2- Jason's Sister:

Any time Jason would talk about Thalia, he immediately went from strong, fierce leader to, as Piper called it, happy puppy mode. For example, him casually mentioning Thalia during a conversation then Hazel asks, "wait, you have a sister?"

"Yes, I have a sister! She's immortal and awesome and her name is Thalia..."

I found something like this on Instagram but I forgot the username... Sorry!

Headcannon #3- Nurse Thalia:

Whenever Jason got sick, he would Iris message Thalia, who would barge into his cabin as soon as humanly possible and not leave his side until she was completely sure that he had recovered. A small part of Jason actually sort of liked getting sick because it meant more time with Thalia. She didn't smother him like Piper did, and she wasn't completely clueless like Leo usually was with this sort of thing.

Just a thingy I made up because, hey, this could totally happen, right? I was thinking that Piper would probably baby him to some extent when he was sick, and how much he would hate that. Then a lightbulb went off in my head and this was born.

Headcannon #4- Acrophobia:

"Jason, I swear, if you don't put me down-"

"Come on, flying is fun."

"Stop... No! Get back on the ground right now or so help me..."

When Jason found out about Thalia's fear of heights, he held onto her and flew about ten feet off the ground. Now picture Thalia screaming insults at her brother until they were safely on the ground. Once they were, she started zapping him with lightning with resulted in a lightning fight between the siblings.

This was another one that I came up with during a loooooong swim practice while randomly letting my mind wander. Mostly because they are siblings, and all siblings fight... Just not always with lightning... Oh, well.

Headcannon #5- Girl Troubles:

The first time Jason ever got in a fight with Piper, he immediately Iris messaged Thalia, who gave him advice about the crazy minds of girls and comforted him. Later (thanks to her awesome advice), Jason and Piper made up about whatever they had been fighting about and things were happy again.

So... Meh. Not sure how great the possibility of this happening is, but Thalia would actually be a great older sister. :) the next five Headcannons will either be Percabeth or maybe Nico and Hazel? Tell me your thoughts.

what was your favorite headcannon?