Is there anything you know should be avoided in terms of themes, creatures, concepts, etc.? This can include phobias, triggers, or firm preferences.
For example, if a Player was arachnophobic, we can remove Giant Spiders from the game world. If a Player has concerns over parental abandonment, we can change the "princess-locked-away-in-a-tower" trope to be more appropriate, or circumvent it entirely depending on the situation.