They're popular because they combine the fun of comics, the visual appeal of animation, and the shareability of memes. It's a perfect combo for catching people's attention.
Asriel and Chara have a complex and tragic story in Undertale. Chara was a human who fell into the Underground. They became friends with Asriel, the prince of the monsters. They had grand plans to free the monsters by using Chara's soul. However, things went horribly wrong. Chara's plan involved sacrificing themselves, but when Asriel tried to carry out their final wish, the humans attacked him, thinking he had killed Chara. Asriel was too kind-hearted to fight back and died as a result.
One important event is when Chara first fell into the Underground and met Asriel. Another is their decision to try and free the monsters together. And of course, the tragic event when Asriel carried Chara's body to the surface and was attacked by humans.
The memes in " Celebrating Years " referred to the memes that had some homonyms in the names of the characters in the play. For example, Fan Xian's name had a homonym of " making a nuisance," which meant that he was an annoying person. Fan Sizhe's name was a homonym for the famous brand " Versace ", implying that he was good at business. Fan Jian's name was a homonym for " cheap ", which matched his character. These jokes added some humor and interest to the characters in the play.
Well, if Undertale could watch Undertale fanfiction, it could lead to some chaos. For example, Sans might make jokes about the wild scenarios in the fanfics. Papyrus, on the other hand, might be eager to correct any misinformation about himself. And Flowey could use it as a way to manipulate things further, seeing how the fans view the characters and using that knowledge to his advantage in this strange, meta - situation.
Some characters might be amused. For example, Sans would probably make some witty remarks about the fanfiction's plot twists. Papyrus, on the other hand, might be a bit confused at first but then get really excited if he finds a heroic role for himself in the fanfiction.
There are some things in the years of celebration. For example, Fan Xian's name was similar to the word " suspect," which matched his despicable and shameless personality. Ye Qingmei's name expressed her ambition and breadth of mind to look down on all men in the world. In addition, Fan Sizhe's name was a homonym for Versace, implying that he was good at business. These memes played a role in adding interest and humor to the play.
The memes in "Celebrating Years" included the homophonic memes of the characters 'names. For example, Fan Xian's name was similar to the word " suspect," which matched his despicable and shameless personality. Ye Qingmei's name expressed her ambition and breadth of mind to look down on all men in the world. Fan Jian's name was a homonym for cheap, while Fan Sizhe's name was a famous luxury item. These memes played a role in adding interest and humor to the play.
There were quite a few modern memes during the celebration. For example, when Fan Xian first saw Teng Zijing, he shouted," Doraemon!" This was obviously a modern joke. Also, when Fan Xian and Xie Bian were discussing swordsmanship, Fan Xian had said," I know about express delivery. Shun Feng Express." This was a joke about Shun Feng Express. In addition, Fan Xian cursed when he recited a poem in court, and Fan Ruoruo said," Give me things every day, and ask for updates." These were also modern uses. The modern memes in the celebration added some humor and interest to the plot.