I’m not gonna be very original here but I think my two favorites are Aziraphale being some sort of protector of queer people and Crowley being so soft for kids that she saved as many as she could during the flood (and any other terrible event he went through). I always lose my ability to think when presented with characters who are soft for kids or have some sort of parental relationship going on, even otherwise shitty stories containing this trope make me cry. Which is also why I refuse to believe that Crowley wouldn’t keep tabs on Warlock after Armaggedon, he has raised the kid for several years, he has to care !!! So, there you go, a third headcanon I like.I’m also very big on Crowley and Aziraphale not feeling an ounce of jealousy if one of them was to have a human sexual partner (because seriously how could their bond compare to anything they could share with humans, and even so I’m sure they’d be supportive of anything bringing pleasure to the other). Also? It’s canon that Crowley is genderfluid, and it’s often headcanoned that Aziraphale has chosen to present male and uses he-his out of convenience but is otherwise agender, and in both cases I’m just *chief’s kiss*.But other than that I’m rather appreciative of the vast majority of headcanons I’ve come accross. Even if I disagree with them I often understand what appeal they can have. I only have a few I kinda dislike ( like the Crowley being Raphael thing, really not my stuff, but even for this one I can appreciate a good fic or some good fanart or be interested in reading why someone might like this headcanon... it’s just not my thing... or the fact that Crowley turns into a snake often, I love a cute snek Crowley as much as everyone else but I can hardly ignore how he stated in the book that he didn’t like to transform because he was scared he was going to be stuck, which led me to a crack headcanon that he only had snake eyes because he didn’t manage to properly turn back to a humanoid form after the temptation in Eden, but I kinda discarded this headcanon when the show came out because all the demons had similar unhuman features ), but as long as the characters remain... well, in character, and that the headcanon doesn’t disrupt -too much- the canon continuity of the story, I’m very tolerant.