Spoiler alert for the Arcane finale and Jinx's appearance is based on the finale.
"War"
Vi and Caitlyn and their group woke up in Zaun somewhere where it seems there was a war going on. They saw Shimmer forces fighting Hextech forces in the streets "Take cover!" a man said.
Zaunites who stole enforcer weapons were shooting at the Hextech forces "What is going on here?" Vi asked.
Soon a giant airship appeared and alternate versions of Mylo, Claggor, and Jinx appeared "Here I am your big fat hero!" Jinx yelled.
Some people cheered as the four Zaunites took the fight to the enforcers. Isha appeared watching the conflict and seem to idolize Jinx. Vi and Caitlyn took cover and they were confused about what's going on they saw a cloaked figure who was staring at them. He leaves and they followed him to an underground lair. "So, a multiversal war now begins." the cloaked figure said.
"What the hell is going on?" Vi asked.
"Well, you be surprised what the Arcane is capable of its capable of creating a multiverse where different points in history played out differently like in this timeline you Vi died during the heist." the cloaked figure said.
Vi was shocked.
"Your battle with the Arcane weaponry opened a portal into a different timeline." the cloaked figure said.
The group didn't know what to say the cloaked figure revealed himself to be a boy around 15 years old he is pale skinned, black hair, and purple eyes. He wears a white tank top and pants and black shoes.
"You must return to your timeline." he said.
"We need Jinx." Caitlyn said.
"This isn't your world. She's no danger in these timelines." he said.
"She killed my mother." Caitlyn said.
"It was Vi's fault for her death she called Powder a jinx and replaced her with you." the cloaked figure said.
Vi attacked him but he using snapped his fingers and time stopped. "This isn't your game; these timelines bend to my will." he said.
"As far as I see Jinx's life is better without you in it." he said to them before leaving.
Once he left time resumed they continued the hunt for Jinx and ran into this world's counterparts of them who is hunting Jinx because Jinx is a vigilante in this timeline and Piltover is hunting down anyone who oppose their order.
Seeing their missions are the same Caitlyn has her group join this world's enforcers to kill Jinx. They were being watched by the cloaked figure who inform this timeline's Jinx about her hunters. Jinx lures them underground and engage in a massive battle with Jinx gaining the upper hand as this Jinx seems mostly seen many battles and she defeated both the main and alternate Vi and Caitlyn.
The cloaked figure used his powers to teleport them out of this timeline and war Jinx was confused by this.