Okay, so since the story of Convert is over for now, I can now calmly explain the plot because so far the story has only been presented in comics and there is a possibility that someone didn't understand some part or someone just doesn't want to look for the first comics.
LORE
Convert was created from parts of the code of all the other Sanses in the multiverse when they all died at the same time in genocidal timelines.
And when they die, like in games, the character's files are redirected to another place so that it doesn't appear in the game after death.
So the redirected files left garbage or rather their fragments, which were so numerous as all the sans in the multiverse left them that these pieces of code aka file fragments were able to merge into a new code, i.e. Convert Sans
Convert at first tried to find out what it was but memories of the deaths of various Sanses gave him the answer
Convert has discovered its ability to dig into and search for codes and even copy and paste them into its own code
That is, pasting the appearance and attack files of other Sans versions into his own code
And so he sat in the Anti-Void where he was created, learning about himself and his abilities (in the meantime he visited various AUs) until Error Sans noticed him and attacked him with the goal of destroying him as an anomaly, which he clearly was. However, Error saw him as a useful tool due to his ability to change appearance and used him as a spy and sent him on solo missions to eliminate other anomalistic Sanses
Of course, under the threat of destroying his soul through the thread he left in his soul to make sure Convert wouldn't betray him or escape so he could kill him at any time.
That's why Convert agreed to kill for him even though he didn't have a brutal nature at first.
Convert worked as Error's puppet for many years until the day when Geno learned of his fate, knowing Erorr's deeds and knowing that if it weren't for Error, Convert wouldn't have committed many crimes.
It was then that Geno Sans decided to help Convert with the help of Anti_Error and Science Sans, asking Science Sans to build a machine that would control the state of Convert's soul while Anti would remove Error's thread from Convert's soul, freeing him from Error's influence
However, Geno and Science did not help Convert as completely selflessly as Convert initially thought. They helped him to make Convert work for the Good Sanses and help them in their conflict with Nightmare and the Evil Sanses Convert knew immediately that he had not been liberated but taken over by the new owners, although he did not know the details about how he was supposed to help them, he was not going to agree to choose someone's side in conflicts and fight on someone else's behalf, so out of rage at those who helped him supposedly selflessly but ultimately failed him, he killed them, finally freeing himself
Free Convert started learning about his skills again, but for a different purpose.
While working for Error, he gained a lot of LV and experience that he didn't have during their first encounter.
Knowing Error's fighting style and using his skills to create a surprise effect, he barely defeated Error after a very difficult battle, killing him in revenge.
Ultimately, he went from a harmless Convert who only wanted to explore the world and himself to something like Fatal Error or more like one of those lonely destructive sans destroying dangerous anomalies and codes
Remembering the massacres he committed while working for Error, he decided to do the same without being subordinate to anyone.
Huff, I never thought I'd be telling this story any other way than through comics, but I was really excited about it.
