Headcanons I have that may be oddly specific possibly due to personal experience, except a few for safety reasons, you'll have to guess which ones aren't from personal experience ;)
Ghost always gets jolts of panic everytime his face gets submerged in cold water
Ghost often forgets to brush his teeth twice a day. He was mostly able to get himself to brush once a day at least but always at night
Ghost sometimes wishes he was bald
Ghost has a banana intolerance (like dairy intolerance, but with bananas)
Ghost and Gaz often develops special interests in things/topics they fear.
Soap has a small fear of rivers, streams and horses. He thinks it stems from stories he heard as a kid about kelpies
Soap and Gaz love storytelling, especially fanfic making. Ghost does too, but he doesn't want to admit it
Gaz is either aroace and/or demi-aroace in some universes, including the canon one (in other universes he's not. Adding this so people don't snipe me)
Gaz has a gut feeling that there's something problematic about Price, but he either doesn't want to admit it or genuinely doesn't know why.
Gaz loves learning new things, especially languages and cultures. Recently, he's been trying to learn about Scottish languages and culture.
Gaz and Ghost hate eating pineapple
König's social anxiety is more due to him worrying about offending people than people offending him.
König sort of wishes he could transfer to a new faction, but doesn't want to abandon his team
König might have puberphonia
I know König isn't SpecGru, but I wish he, Nikto and Horangi were
