I don't know how to start off this conversation, but personally I like to add a bit of unrealistic-like aspects to my worlds, even though I also try to make them realistic most times, mainly with current events and issues, I guess.
For example, I have a few characters with multiple personality disorders, and I tend to make a whole different character for their personalities, (except for a few, but this only applies if I'm super lazy or said character has more than 3 personalities) and there is some way they transform into that personality—like getting hidden by some bright light/dark shadow, etc. and when it leaves they're a completely different person, or just by having some shift, etc..
Another example is when it comes to religion, I normally make my characters polytheist due to the fact that I have several god-like characters, but I do have atheist characters. My only atheist character so far though, is Zion. To display this, I make him have the inability to see and hear gods—only when they are in their god form, though.
The basic purpose of this was to share out my ways of creating diversity, and how I manage it. I want to know what you guys feel about this, do you like it? Should I add something else or change anything to be different so it makes it realistic or relatable? I personally find this weird even though it's my own way of expressing things in a bit easier, almost obvious way, I guess. I'm really awkward so I don't know if this actually makes too much sense. If you need clarification, you can always ask me to restate things. I hope this wasn't too weird to process and such.