Potentially silly goofy headcanons buttttt-
• Solar is the mechanic by title and Moon's good with inventions, but cars? Vehicles?? Automobiles??? Ohhhh that is Sun's wheelhouse, baby. It started at first as a passing interest bc of his infatuation with Roxanne, but eventually he became ENTHRALLED. He rarely gets a chance to talk about it, bc most people assume he doesn't know anything ((bonus reason for why he gets upset when Moon tinkers with or 'fixes' his car-)).
~ piggybacking off of that, his car maintenance days are never outright a secret, but he does prefer to do it when the others aren't home. Dazzle and Jack enjoy helping though, and he teaches them small bits and bobs.
• Sun, Moon and Earth are all coffee drinkers. Sun drinks his black with maybe a teeny bit of sugar, Moon's is more sweatened creamer than coffee, and Earth prefers hers as a comfy middle between the two. Lunar isn't a fan of coffee, but will mix chocolate and hazelnut creamer if he has it - it's the only way to avoid them aggressivly and dramatically gagging. Solar just doesn't do coffee at all.
• Jack and Dazzle got into the habit with Sun of sitting together with coffee (Sun) and hot chocolate (kids) for their early morning wake up routine.
((Okay that's all sorry it was so long ily bye 👋 ))