I tried to post this on another website about Xenoverse 3 but they don't allow wishlists, it's just a story idea I had:
The beginning of the game should cover the OG Dragon Ball events but with Z Villains and Characters showing up to drastically damage the timeline:
It would start with Gohan discovering Goku and Frieza Soldiers showing up which you have to defeat to protect Gohan Sr. and Goku. (Inspired from a DBOnline mission)
Later on when Goku meets Eighter, Android 16 shows up to kill Goku when he is a kid. (I kinda got inspired by the What if from Budokai Tenkaichi)
My reasoning with this would be to satisfy OG Dragon Ball fans while knocking out some parts of Z. When they move over to the other sagas they don't have to do everything from the saga.
Battle of Gods and Resurrection F would follow the anime versions with some changes - like this time Ginyu would swap with Vegeta after becoming Tagoma. That means the Ginyu stuff wouldn't happen in the Frieza Saga earlier in the game, it would happen later. I'd imagine that the rest of the Ginyu Force would be revived too, to help Ginyu out.
I think it's safe to say that the biggest moments like Goku going SSJ for the first time, the Frieza fight, Gohan going SSJ2 and the Final Battles of each saga will still happen but they'll go more in depth with stuff we haven't gotten to see yet. (Missing forms of Frieza and Cell - but I think they could have Frieza toy with the characters in the Ressurection F saga
What if we delve into the OG timeline where Goku fights Mecha Frieza and King Cold but they're more OP. If Goku dies and then the Cold Family (with Cooler) kills everyone, Trunks wouldn't be born and join the Time Patrol. They could even have King Cold go into a Final Form like Frieza.
Some of the Buu Saga could take place in the Future Trunks timeline where we fight with Future Trunks against Dabura and maybe Buu gets set free this time around.
The Tournament of Power would have a simple change - one of the characters would get incapacitated before and you have to join. Maybe another character would get taken out of the picture too so depending on your Xenoverse 2 choices - either Bardock, Future Trunks, Your mentor or your Xenoverse 2 character would show up to be in Team Universe 7. I think Frieza still would be on the team and it's possible he'll get taken over to sabotage Universe 7.
I could see them covering the Broly movie too, not sure what they could change though besides Broly getting stronger. Maybe Goku and Vegeta mess up the fusion and become Veku and you have to protect him?
There's room for other crazy stuff in the story like Time Breaker Arale showing up in the Android Saga, Having to go back in time to help the SKOT fight a more powerful Demigra, Super 17 absorbing 18 like in DBHeroes, etc.
For Races -