The Beta Kids!
John: (I also like June so a lot of these headcannons will pertain to her as well since they are the same person and just different genders) John is a windy kid indeed often liking to move crazily and unpredictably like it. Often he can be found flailing around. He loves to move around, and hates sitting still. This wiggle maniac has a lot of fun dancing and having a good time.
Rose: Rose is meticulous and often finds organizing things to be very therapeutic. Sometimes after a lot of knitting, or spending time with one of her rowdy friends her room can get a bit messy. So she will spend time cleaning, decorating, and reorganizing things. She will also redecorate if something stressful has happened recently. Most people she’s friends with always have a new view of her room when they come over. Dave: Mr.Strider LOVES clocks and watches. He is obsessed with knowing the time (possibly because of his aspect) He often has at least three different watches on him. He checks them pretty consistently, to make sure that they are all synchronized. He also loves pocket watches, he thinks they look so fucking cool and he collects them.
Jade: Jade is still very forgetful in her adult years but tries her best to remember the important stuff. She still uses her classic finger band method but she also sets alarms like a lot of alarms. Alarms for all her friends birthdays Alarms for important events. Anything that could be important gets an alarm. She also has a big collection of books she calls "memory books" where she will write lots of things about her friends. She looks through them every once in a while and she also adds more things. This way she can keep tabs on the things her friends like.
I hope you like my stuff so far!!
(got the idea for Dave’s from @ghostyectobiologist)