What would the OoNQ get for their S/O's birthday?
King Knight: Throws a lavish party, a whole ball and banquet just for them. Gives them very expensive presents and anything they ask for. Of course, if that’s something they’re comfortable with. If they aren’t King Knight is perfectly happy to throw a small private party.
Specter Knight: Something sentimental, something that means a lot to both he and his S/O. Says it's "no big deal" when thanked. Doesn’t make a big show of it.
Plague Knight: Makes a potion or gives high quality potion ingredients, Plague's S/O is more than likely someone that's into alchemy as well. Either that or goes out and does something dangerous to get something big that makes a huge "I love you" statement.
Treasure Knight: Obviously gives treasures. Not just gold and gems but things his S/O would consider treasures or things special to them. They're one of his greatest treasures after all, so he does anything to make sure they know it.
Mole Knight: He gives relics and treasures and other neat things he's found during his excavations. He always tries really hard to give his S/O the shiniest and coolest things he finds every year.
Tinker Knight: Makes them something of course! Some invention he's been fretting over and tinkering with in secret the whole year for their special day, something that was inspired heavily by his S/O.
Propeller Knight: Has an entire romantic evening planned with dinner, dancing and seeing the most beautiful sights the Valley has to offer. He of course gets them something cheesy romantic like fine jewelry and fancy chocolates and flowers.
Polar Knight: Something simple and from the heart. He's not really one to show outward emotions, but he really deeply cares for his S/O and gives them something they've always wanted. He makes a point to be near them all day and trying things they like.