Hi!
So, currently there is one more mini-arc after unlocking the missions, but you need to wait 7 in-game days before it starts, if I'm not mistaken.
Regarding the NPCs, they are not implemented yet. They will start appearing in the next update and in future updates. And yes, the behaviour in the hospital is correct.
As for the personality system, it will not be present in this game. A large part of the workload in the previous Raijin came from that system. I basically had to write every dialogue up to five different times for each scene, depending on the personality trait, as well as account for how each character would react to it.
It became quite exhausting, and since Classic Era is much more complex than its predecessor, I decided to remove the system.
However, if you played the previous Raijin and imported your save, you will receive a special passive based on your strongest personality trait.
That said, I do have plans to bring the personality system back in a future sequel. For Classic Era, though, it won't be returning.
Regarding the art, some of it is made by me, such as the sprites, while the rest is, unfortunately, AI-generated.
I would love to have an artist working with me, but this is still a hobby project. I don't have the spare money to invest in an artist, and the game itself doesn't generate enough revenue to support one at the moment.
My goal in the future is definitely to have an artist working alongside me, but for now, I have to make the best of the tools I have available.