Can you believe this is the first digital ref Codebreaker's gotten since i made them 7 years ago. Insane. Also I ran out of room on the ref to note it but when they get super stressed out their glitches get worse and they get marks on their face and hands like Gaster has.
(For simplicity's sake I'm just going to be referring to them as Codebreaker and by they/them throughout this bio, but Codebreaker and Frisk can be used interchangeably as their name, and while they prefer they/them any other pronoun works just fine too. Also this got really long, you have been warned.)
Codebreaker is an outcode who barely managed to escape their universe as it imploded due to corruption. They're selectively mute, primarily using asl to communicate, though they do carry notebooks in case they have to talk with someone who doesn't know sign. They're dorky, kind, compassionate, a bit of a bleeding heart at times, and of course incredibly determined. Since the death of their universe, they've been plagued with guilt and anxiety. Their's primary motivation and role within the multiverse is to maintain the integrity of corrupt timelines and, worst come to worst, figure out how to safely evacuate the residents before their universes collapse just like Codebreaker's did.
As for how their universe ended... after completing what we know as a true pacifist run, Codebreaker decided to take one last walk through the entire underground to make sure everyone knew the barrier was broken. Though, on their way through Waterfall, something changed - that eerily empty hall they'd passed through before now contained a grey door. Curious as they are, they peeked inside, met face to face with a strange goopy skeleton-looking monster.
Codebreaker gets straight to the introductions - "Hi, I'm Frisk, yes I'm a human please don't fight me, also the barrier is broken" - but what remained of Gaster did not care to listen. He only wished to become whole again by any means necessary. Gaster attacks, aiming to take their soul to save himself. Codebreaker attempts to explain their way out of the battle, but with Gaster not even bothering to read their hands they had no choice but to run. Before they could get away, however, they did take a few hits. By the time they noticed the strange monster had left his mark on their soul, it was already far too late.
The residue of himself Gaster had left on their soul corrupted it, their determination, and by extension their SAVE file, turning their universe into a ticking time bomb. Over the short months before the world collapsed, they learned their corrupt soul granted them the ability to do magic and begged Toriel for lessons.
They eventually confided in Sans about the strange encounter, seeing as they were quite close to the skeleton, viewing him and Papyrus as the brothers they'd never had. That conversation lead them to the dreaded realization that their world was ending slowly and there was nothing that could be done to save it. Codebreaker did their best to reassure their friend, but it's not like there was a happy ending they could promise. This was it.
Sometime between then and their universe's collapse, Sans gave them one of his spare jackets. He didn't make a big deal of it, of course, but seeing as he no longer existed... it became a big deal posthumously.
The implosion of a universe isn't as dramatic as it sounds. There was no flashy explosion, no apocalyptic catastrophe. There was simply the world, and then there wasn't. In the void left behind by their universe's demise, Codebreaker was all that was left. They eventually found something in the darkness; a small, glowing light, so minor it wouldn't have been noticeable if anything else remained in the world.
Reaching for the light, they found themself outside their universe. They weren't sure how they knew that, it just sort of appeared in their brain; they were looking down at what had been their entire life, now just a dark void. And it wasn't just that - the dark, corrupted parts of their soul had completely disappeared, leaving gaps missing in their place. Upon checking themself over, they realized they'd lost 7 max hp from it, too. Small glitchy shapes hovered around them, and though they wouldn't realize it for a while, they'd gained the abilities to teleport and summon gaster blasters. This is also when their scleras turned black, and they started wearing their hair over their eyes to hide them.
Looking around, they were surrounded by other universes, each their own isolated existence, and they were overcome with a burning feeling they were so, so familiar with: determination. Determination to protect these worlds they'd never known of before from what they'd just gone through. Over time, the abyss of their universe calmed into a peaceful white void, where they would take anyone who had to witness their worlds fall apart.
