Yet more ideas
Jaune and Pyrrha are paired with Yang and Blake instead of Ren/Nora. How does this affect anything? Will Yang make a move when she learns how well Jaune can dance?
When Blake (along with the rest of RWY) inform JNPR that she is going to admit something, Jaune (who knows who Blake is because either he knows faunus or he was taught by Great Grandma Arturia to learn about other Prince and Princess) thanks the Princess for trusting everyone with all that, much to RWY's and NPR's shock about having an actual Princess in their midst
When Pyrrha confronts Cinder, Cinder is more violent than in Canon. Reason? Pyrrha has been keeping ever other woman from making a go at Jaune and Cinder is tired of being clam-jammed
Jaune's sister is the writer for Ninja in Love and he is the tired editor. When he hears about the destruction visited upon Blake's collection he feels sorry for her and asks his sister to sign a copy for Blake that he then gives to her. How does everyone react to JAune giving Blake smut. What is their further reactaion when they learn he is the editor?
Yang, frustrated at everything going on (Blake and White Fang, grades, etc) hears Jaune tell Pyrrha something WRONG and snaps. No, Ruins on Remnant 3.5 is not the greatest edition its Advanced Ruins on Remnant. Yang's sordid past as a TTRPG nerd is exposed for all and sundry.
Roman Torchwick is known to the Arc Conglomerate as 'Uncle Alex,' something he is sad to have a deception since he can relax at the family get togethers (despote Isabel glaring at him. Is it his fault he gave Saphron some better advice then "Be Confident" when she told him about asking Terra out for a date?) So imagine his surprise when one evening he gets a call from Jaune asking what to do about his partner. He (Jaune) thinks she has a crush on him but from what he can tell she has never had a friend ever so he wants to be that and not take advantage of her. After some actually good advice, half an hour later his actual niece calls, who is none other than Pyrrha! She then gives him TMI about her partner and Leader and asks how to get it through his head she is interested. What does Roman do? Ignore Neo and her gag business cards reading Roman Torchwick; Gentleman Thief and Love Doctor
Similar to above, but Jaune recognizes 'Cousin Mint' when JNPR and CInder's team meets
Same background, but the Arcs know who Uncle Alex is (One doesn't have as long a family line as the Arcs without Blackguards in there) they just don't care
An Arc keeps their word, but nothing is ever said regarding fraud, lying, and murder sorry, 'self defense'
NPR and RWBY have each individually done a very stupid thing and now Peggy Sue back through time. This is the first time they have all returned to this timeline. (How do they interact with each other? Did anyone one of them start dehumanizing people after all the death and repeats?) However, Jaune has been doing this far longer and is either burnt out completely on life or taking what vacation he can in his personal hell. What does NPR and RWBY do when they realize Jaune isn't at Beacon on the first night sleep over?
Ruby was able to get to Pyrrha and Cinder earlier so Pyrrha is only in a coma for a few years (until canon timeline got to Atlas) how does she react to a world moved on? How does RWBY and JNR deal with her Coma and Waking?
We all know about Jaune and the Thirsty Mothers Brigade, but how does Jaune's significant (any member of RWBY or NPR) react to constant pushiness? It might have been funny at first but it's been a few weeks! Get a clue!
Everyone in the Arc family gets airsick like no ones business. One reason Isabel became a doctor (and a secret she will never tell anyone) is because she can bulk order new barf bags and no one will look at her oddly. A shipment that Isabel redirected to Jaune is the greatest present he could ask for (much to NPR and RWBY's confusion)