It is an interesting topic. Technically speaking, Anders never lost a single year after he died. He would roam around the world as a ghost since ever. He "lived" and explored the world and its technologic progress throughout the years. The only problem here is that he can't interact with it, just see it.
I will make you an example: hoverboards. Anders has seen the how a normal plank of wood with wheels would turn into an AIR-fueled, lightweight plank of steel and special fabbric. If he was tangible, then he would sure try one of those in no time, because he's a curious guy and loves to study new things. How Anders feels about new technology? He likes it and wished that there would've have been this type of technology in his past, especially medicines, electricity and GPS.

Autumn and Allen: Oh they love Christmas, so they would probably start to decorate their apartment as soon Halloween finishes: Autumn gets ready to buy a big Christmas tree and get the cutest accessories to hang on it and for the small sister she will buy the chocolate calendar, which every day has got a little snack to eat.
Allen will write a big ass list to Santa Claus with all her wishes: cooler toys, new EG skates, new videogames, a giant lasagna to eat by herself and a music CD with all the funky tunes. Autumn's wallet cries already.

Magalie's family: If we talk about the past, when Wave and Pearl were just lil children, then Magalie and her husband (not Tsunami) would try to be ready when Christmas comes, despite both Mag and the handsome dude are really busy people with their hard job. Christmas gifts were never a problem for this family and you know why. They would spoil their children, or better Magalie spoiled them. Husbando wants to teach them that they need to earn what they ask.
In the present day they just celebrate it with Quiet, now that Wave lives alone or is busy with her criminal business.

Quiet's family: In the past, Quiet had her baby Storm and Jet to take care and spoil for Christams. She's not someone who celebrates it religiousely, but Quiet knows it is important for the children.
Christmas lunch and dinner are probably the best part of the holiday, according to both the hawk and albatross.

Diana: Being a lone "wolf" she doesn't care about celebrating it, but she gets invited by Mag to celebrate it with her anyway. She would cook something delicious for the day to exchange the gesture.

Tempest: She doesn't celebrate it but she gifts herself the best liquor and chills watching the snow from her abandoned ship. Sometimes she remembers the past Christmas times, when she was still "dating" Stream and hanging out with the others. Somehow she liked it and you could get free food and alcohol. Better life didn't exist.

Yves: This anxious Fennec Fox would take 2 weeks from her job and fly back to France to visit her parents and her 4 younger siblings, taking with herself the goodies like food, snacks and other objects exclusive to Soleanna
She celebrates Christmas like a normal family would do!

Anders: He's a ghost, so he can't do much about it. However he observes the living enjoying the holiday and he gets extremely curious on the lights, silly decorations and the music surrounding this event. He's surprised how much money people spend in this time of the year but he wishes he could feel their same joy.

The "Witch of Soleanna" rumor.
Kingdom Valley used to be a zone lived by dukes, duchesses and important priests until 200 years ago, when the most important castle of that area was taken by a mysterious woman. The noble families who lived inside the castle moved to Soleanna Old City since then. Kingdom Valley is an "off-limits" zone, even in CWAU. No one, not even Elise III, can go through the mysterious forests and decaying ruins.

Why?

According to rumors, this witch is known to take whoever gets closer to her home and do the worst possibile things to them. These rumors managed to become true, in fact whoever tried to have an adventure in Kingdom Valley never returned back alive to tell about her existence.
Some people believe it is this mysterious woman doing these atrocities, some believe these tourists just lost the way and died trying to return back.

Nobody knows the truth, right? Well, not really.

It is said that G.U.N. has got images of this woman, but they won't confirm nor deny her existence to the Soleannians because that would increase their curiosity to visit the ancient castle. Not only that, G.U.N. don't want to do anything with her in first place, if she exists that is.
Even the nobles of Soleanna may know something about this witch. Old notes and stories about her arrival are hidden inside the royal library where Elise The Third lives.

Not so horror, but the witch of Soleanna is also used as boogie man to little kids if they misbehave.

"If you aren't nice, then the witch of Soleanna will snatch you!"

Quiet's story? Before joining Stream to complete the lost Babylon Rogues family Quiet was living in Ice Mountain Zone, in a small village up on the cold and snowy mountains. She wasn't aware of her babylonian traditions nor anything related to Babylon, except she had an unusual necklace left by her parents before they would disappear in a blizzard. (The same Storm wears canonically). She used to be a huntress to catch deers and other big animals to feed the village and also defending them from the same big animals, monsters or strangers.
She talks russian and you can hear that strong accent when she tries to speak in english/italian with the others.
Quiet's love story wasn't the best either, as the man which she made love with completely left her after he knew Quiet was waiting for Storm.
After that sad experience, Quiet refused to have a partner and grew Storm "alone". Stream and the others helped her when she really needed it, but she stood for herself.

Baby Storm never felt like he was missing a father. Even in CW's present he doesn't need to know who he was or why he left. Storm just appreciated the big effort of his mom raising him to become a man.