-They have a car but they prefer to walk (or travel via world tree) if they can
-When they do take the car Blitzen drives because Hearthstone doesn't like to
-Around others Hearth is completely silent but around Blitz he'll sometime whine or something like that (Hearth making puppy dog noises is all I ask)
-They love to watch movies together (with subtitles of course)
-Blitz gets really mad if the subtitles are inaccurate
-Blitz works non stop and Hearth usually has to physically force him to take a break (Please someone get my references)
-Hearths hair is always messy and is really annoys Blitz
-So much so that Blitz demands he let him fix it
-Hearth gets ear piercings because hes self conscious about his ears
-BLITZSTONE CUDDLES
-Hearth likes being outside in the sunlight
-Blitzen hates being outside in the sunlight
-They compromise with a balcony, Hearth sits in the sun, Blitz in the shade and they just sit out there together
-So I know I wrote a oneshot about Hearth being amazed by the snow but I also headcanon he hates winter 'It's always cold and the sun is never out'
-Blitz on the other hand hates summer "Do you know how hot it is wearing all these layers then going out in 98 degree weather?"
-They both love autumn, they'll take walks around the city or through the Boston common
-Blitz still has to wear the sun protection gear but its more bearable when its not a million degrees out
-Someone, idk who suggesting all these Christmas movies with elves in them to Hearth especially "Elf"
-I said it once and I'll say it again: Blitzstone cuddles
