Well here i go again, just got done with suggesting stuff for the cash shop, i wasn't supposed to post afterwards, but ended up making this thread as i doubt i'd get this creative or motivated afterwards, it's an artist thing (or just a human trait in general).
So, i don't know how many are familiar with Banjo Kazooie romhacks (ones made by Kurko primarily, Mark Kurko), but those are basically romhacks where you can play as Banjo (protagonist of Banjo & Kazooie) in custom maps or those that are from legend of zelda series, but with textures being replaced by Banjo Kazooie ones, more or less (or simply making the soundfont within Banjo's soundfont).
I highly doubt this is possible or even recommended within dragon ball online (DBOGR), but such concept would be fun.
Of course, the maps wouldn't be just copy-pasted, but could be used for base or reference, then trying to make it look more original.
One i'd really like (personally) would be a large event map that'd be like the Termina Field from LoZ Majoras' Mask. It could be used for custom
event or story, which its own villain. That, and/or used for something like treasure hunting, research, grinding etc
It would also be pretty entertaining or funny if such maps or worlds had their own version of someone like Goku or Vegeta.
Alternatively (i have a feeling this won't be possible or "not that simple", but i'm giving it a try regardless) an existing overworld map, like the one we enter after leaving from Kokkara village, except it could be perhaps more restricted, slightly changed, mirrored, have different textures, NPCs, mobs, dialogues and soundtrack etc
You could enter such maps via teleportation (like when entering dungeons), either after completing certain quests and talking with the corresponding NPC that sends you there. Some event or story maps like these could require a certain level like 30, 40 or even 70.
I do know (after playing genshin, and i hope that won't trigger anyone) that maps do take space, so this type of event maps could be timed and leave after 1 month or 3 months, and be brought back again within the same year after 3 months or 5 months. Am aware though that there's high chance it's not that easy or even possible within DBOGR, so am prepared for disappointments, but at least i'm having fun suggesting stuff.
Finally (i should keep going but i do have to eat soon and may end up typing way too much), i know a lot of people only care about combat and not so much about stories, but i just...think it'd be worth the effort and time, and perhaps give people unique experience when it comes to modding, working on maps, events, dialogue, plot, story etc
And i know this is risky or simply not possible, but perhaps this type of maps (or ones that are permanent) could have a system where you can reach level 80 or 100 (could show in red or different color) but return to actual level after leaving the map (no level reset since i can see that ending horribly). After reaching those levels you could open a box you receive within such world or event map (same idea with the level box you usually get as a beginner that gives you popo's earrings, exp boost etc). These event level boxes could contain lots of zeni like 5,000,000 or less, items that usually take long to grind, unique small pets, new title and whatnot