I believe I and a few others on the forum may have mentioned this already, but a lot of players expected InZoi to be a huge mix of aspects from games like the Sims and GTA. One of the ways to achieve this and bring more depth and realism to Inzoi would be adding a proper injury system and a more developed combat mechanic (both of which would be optional/toggleable.)
Injury System
I think it would add a lot to the game if Zois could suffer different levels of injuries from accidents, fights, falls, car crashes, or workplace mishaps. Injuries could range from bruises, sprains, burns, broken bones, and concussions to more serious wounds.
Each injury type would impact gameplay (e.g., limping slows walking, broken arm limits what your zoi can carry/do, head injuries may affect mood or memory temporarily, or causes headaches.)
This would also go well with suggestions incolving more medical related stuff, as this would include the need for treatment options: first-aid, doctors, hospitals, or even ignoring an injury (with consequences like infections or permanent scars). Scars could become a long-term cosmetic and story element — a reminder of your Zoi’s past choices (which could of course be removed in CAZ.)
This system could also be inspired by Project Zomboid’s as injury system, with a bit less weight on the gameplay (so that the injury system functions similarly except more so a background thing) and a bit more depth. This feature could be toggleable in settings, similar to dynamic weight and muscle, there would also be dynamic injuries / illness.
Combat System
Inzoi could add a basic hand-to-hand combat system (blocking, dodging, grappling) that feels realistic. This could also include weapons (inspired by GTA and Project Zomboid) you can use in combat when you equip them from your backpack. Getting into fights should have consequences:
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Legal trouble (arrest, fines, jail time).
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Reputation impact (family or friends may disapprove, fans may turn on you if you’re famous).
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Physical risk (injuries, long recovery times).
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Random altercations could occur in the world — angry strangers, bar fights, jealous rivals — adding to the realism and unpredictability of daily life.
This combat system could be enabled with a button, and would be more or less only playable as those who use the WASD playing style. This would also affect the user interface, especially when displaying remaining ammunition and such. Functions such as moving the mouse and clicking to interact could still exist, or the cursor could be locked to a certain point. Otherwise, InZoi could add an aiming function to aim firearms or weapons.
This system would be more optional but open the playstyle for those coming from other gaming genres, but still enjoy realistic simulation. For those not enabling the combat system but still interested in combat, the simple interaction interface could also open up interactions in conflict (or a violence area) and have some interactions for fighting, violence, etc, with new ones appearing based on your relationship/history with the person as well as what your zoi has in their inventory.
Other Details
Zois should also be able to protect themselves if attacked, instead of just being passive.
Medical records, hospital bills, or recovery times could tie into broader gameplay systems like insurance, jobs, or family stress.
Long-term injuries or trauma could influence how Zois behave in the future (e.g., avoiding risky situations, becoming more cautious, or even having anxiety tied to past events).
All in all this feature could make gameplay more interesting and realistic. Imagine a gameplay scenario where you attack a family member and they go into a coma, and they wake up and the whole family finds out!!