What are your headcanons for your characters?

I imagine mine is constantly doodling pictures of Merula with hearts around them and then hiding the evidence from Rowan. Right now she's only second year so she's not thinking about singing First of May by Jonathan Coulton yet. ( Also that song didn't exist in the 80s) but she's definitely got a crush. Every time she's bitchy to Merula she's trying to impress her. She likes Rowan as a useful ally and friend but would avada kedavra her for Merula. She's also creeped out by Penny. There's something to perfect about her. She suspects Penny is secretly evil. She's cool with cowardly whatshisface . She absolutely hates Snape. " I am not my brother you never gave me a chance to prove myself. You just treat me like him! I can't stand his stupid crazy ass. But I don't deserve to be blamed for his fucking messes This is why I'm joining the Death Eaters. At least then I might get some damn respect!" Unfortunately she'll learn Snape is a death eater so she'll never win.