LuisCarlos17f
Legend
If you read some isekai comic you may find a special trope, the holographic screen showing game stats and working like an interactive HUD. These are used by the main characters to unlock new abilities in some talent-tree.
Those titles aren't easy to be adapted into a D&D campaign because the main characters follow a different leveling-up and usually they are overpowered for D&D standars, and the worldbuilding is relatively simple where there is only one main menace or antagonist faction, the demon king.
Some times I imagined a D&D version of isekai manga. Of course it would be with the trope of being hit by a truck, but here I would add some piece of originality. The hit wasn't an accident but intentional because ... plot twist! the truck is an evil version of Optimus Prime, leader of autobots (Transfomers franchise). When this evil Optimus Prime wants to kill some human creates something like an energy field. This teorically should work like a desintegrator ray but the true effect is more like a teletransportation toward a parallel world.
An D&D PC using a holographic HUD? This could be a class, something that would need a lot of work and time, or like a magic item.
My idea is this fantasy interface wouldn't be used for combat but other uses like crafting, building (also placing traps like in a tower defense videogame) or trading (you hunt a monster and the meat, bones and skins are teletransported toward a shop within a town). Or could be used for investigation useful to search and analyze possible clues. Or it could be used to scan bodies of sick patients to craft medicines. Or it could use genetic engineering to create plasma fruits that could be eaten by vampires.
Perhaps this interface could benefit from the help of a virtual assistant like Cortana from Halo videogames.
The interace could be used to record images and sounds, or to direct remote-control construct units.
Could you craft modern firearms? maybe, they would be a "nerferd" version and time-limited like summoned monster allies. It would automatically disintegrate if an attempt were made to disassemble it for reverse engineering, and it also requires special alloys. (In real life, a firearm could deform or even melt from overheating if fired continuously.)
If you want you could add some touch of analogic horror with some element style cursed videotape or yandere spirit who is too jealous to allow pretty females too near you.
About isekai genre I don't mind if a main character with only female sidekicks (in friend-zone) but I don't like when the MC marries several wives because in the real life would fight over the children's inheritance. If, due to polygamy, there is no custom of the firstborn being the heir, then every time a sovereign died, a civil war would break out over the succession.
