Either after being expelled from beacon, falling into the void in volume 8, or during thw last moments in the ever after Jaune arrives in Teyvat were he tries to look a way back home while traveling all the nations and forging friendships and maybe more.
It could also be a reaction from those in remnant.
Jaune's new look:
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This outfit probably given to him after the first archon quest as his original got damaged.
Weapon
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Finally for his romantic interests. Unlike most it's not all girls as some I feel the relation wouldn't be there. Also no Lumine unless Jaune arrived during the end of Volume 8 and team RWBY sided with Aether.
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