Hyun-ju (Squid Game)

How she survives the games: walks into the damn room to tell everyone she's found the exit, so 333/Myung-gi sees Jun-hee/222 is in the room and walks away. Her leg wound (which is less horrible than in canon) keeps her from fighting Yong-Sik/007 moments later and Geum-Ja/149 has to intervene, unless you want them to live too. She carries Jun-Hee through Jump the Rope. Their presence changes what
happens on the towers too: the poor Lunch-Box guy is stopped from killing himself and 333 throws him off the third tower.
222 takes twice the money (hers and the baby's). In-ho still got the lesson that 'no, not everybody has to lose their humanity' when Gi-Hun refused to kill the sleeping players anyway.

(Unless you want to go with the potential 'someone has to die after lunch-box guy kills himself, 333 attacks Gi-hun after pressing the button and either woman pushes him off, for added drama)

 potential secondary au for interactions with the other "group": she's only slashed once on her back and given for dead. She wakes in her coffin and is able to escape due to the mess happening among pink soldiers because of No-eul/soldier 11. She can join No-eul and Gyeong-seok in their escape. This is also how she may end up interacting with In-ho (after all, she also proved something by going back when she could have simply escaped) and Jun-ho..

we can use the fact that she survived to justify anyone else's survival too if you want/if you write someone else who died. Both AUs work in that sense (in the second one, she could interrupt the third game too since she's basically a one-woman army, she's open to suggestions)

AFTER the game: gonna go with a FRIENDS-type AU: she sticks around the people she's grown to care for who lived (Jun-hee, and your muses in aus in which they survive, if they were allies) instead of going to Thailand right away. She's still having her surgeries but slowly, what happened in the games was traumatic as hell. 

please do remember I hate writing character-death and I see no point in us writing a thread or two in the game and then your character dies and...? end of interaction or starting over and writing nearly the same things?

some headcanons: she stayed out of Gin-hun and Dae-ho's conflict because she sees both points of view, they are both broken men who are acting on their emotions and she's frankly more interested in surviving and protecting her little group. She pities both of them and Min-su later. She's permanently devastated over Young-mi's death, due to her vote to stay. She loves the mother-son duo. Gets very protective of anyone who may imply they look up to her or like her. 

Orientation: bi (but at the moment she'd try to keep things platonic or at least non-physical because suffering from too much dysphoria, at least until her surgery)

please do read the wanted interactions and remember that while I'm happy to write with people she didn't canonically meet, she was very shy and quiet so your character may have to be the one approaching her first even if I write you a starter.