Like i said before, there are very few DMs who allow literally any type of character. Some DMs don't allow evil characters, some DMs don't allow horny characters, some DMs don't allow lone-wolf solo characters. I personally, rather than need to micromanage a players every decisions minute to minute, would instead ask up front that people don't make characters that are made to be directly contrarian to the very normal fantasy world i prefer to play in. I don't think it's too much to ask of people that they please not make characters that atheist clerics, nature-hating druids, illiterate wizards, never-angry barbarians or other such things. That still leaves an enormous variety of characters people can make and flesh out. Other DMs might be fine with any or all of those, but other DMs can be fine with evil characters, pvp characters, and that kind of stuff, which is fine, but i don't think it's unreasonable to ask that people stick to this level of very broad guideline for character creation.