Headcanons list! (Add more if you wish) 

deceptive-fox:

• ½ = How the character feels about people taller or shorter than them
• ± = The character and what they think about math
• † = How the character feels about murder
• @ = How the character appears online
• ¥ = How the character handles money or spends it
• ° = The character’s temperature preferences 
• æ = The character and languages (Known or Want to Learn)
• ↔ = The character’s ability to read directions
• ♥ = Character’s preference for relationships (sexuality, type of person, etc.)
• z^zz= What time the character enjoys sleep or being awake
• ☂ = Weather the character enjoys
• ♪ = What music the character likes
• ( =①ω①=) = What animals the character likes and if they have a pet/pets
• (・∀・ ) = The character’s emotional state most of the time
• ☆～（ゝ。∂）= How the character greets people
• ⊙﹏☉ = What flusters the character
• (≧∇≦) = What makes the character happy
• (/□＼*)・゜ = What makes the character blush
• (;╹⌓╹) = What scares the character
• （；へ：） = What makes the character cry
• (´ q ` ” ) = The character’s “guilty” pleasure
• （・□・；） = What makes the character uncomfortable
• (*^◇^)_旦 = What the character likes to eat and drink
• ｡ﾟ(TヮT)ﾟ｡ = What makes the character laugh
• (´；Д；｀) = What worries the character
• (⑅ ‘﹃’ ) = What the character daydreams or thinks about
• ( ⌒o⌒)人(⌒-⌒ ) = Friends the character has or would like to make