Don't let them just show up with a character.Plus you'll always have those players wandering in and out of most campaigns who aren't all that familiar with the world and show up with 'joe the deva' or whatever. It isn't the end of the world, but sometimes it does kind of put a dent in the setting.
Unless the setting is REALLY extraordinarily in your face players are just going to basically be like "yeah, so what your world has intelligent plants instead of Tieflings, I want to play a Tiefling Warlock!" What are you going to say?
"See the door? That is the exit. You can choose to play in the setting or use the door." Actually, my players would show the person the door first.
In the end if you want things to be just exactly so, then write your own setting appropriate RPG. Otherwise you gotta take what you get.
No. There is no need to create you own rpg. Create your setting is perflectly viable.
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