Why are all the people in my chat group rumored to be from the outside world?

Good news: Ember has traveled through time.
Bad news: It's Dark Souls 3! At least there's a chat group, but something's wrong with his chat group!
Kevin: What savior warrior? I'm just a working-class person who just moved to Golden Courtyard.
Doctor: Holy crap, wasn't there supposed to be a girl? How come it's a mysterious masked man opening the coffin? And from now on, don't call me the Doctor of Rhodes Island, call me the college student of Reunion.
Star: What pioneers? I'm not familiar with them. I'm a staff member at the Black Tower Space Station.
Ember: ...Holy crap! Why are all the members in my chat group characters from the side stories? This just doesn't make sense.
Let's not even talk about whether these guys can help him beat Professor Gudari.
The problem they now face is:
Rainy night, overpass, Maybach.
Looking ahead at the figure riding a tall, magnificent horse.
Ember: ...You'd be better off not joining this chat group at all.
But... since we're already here, he's the only one who can fill in.
Let that guy riding a horse on the highway see what it means to be immortal!
Ember: Do you think you can kill me?!