We would recommend keeping it concise and really hone in on the character and their personal background rather than extensive world information. A link can be added for more information, but the details in the app itself are those that we will be focusing on.
Using bullet-points would be a good option to summarize further whenever necessary. What matters to us is to know what frame of mind the character will be in when coming to Xist, and why they've got to that point. For the worldbuilding, summarize the world with a focus on fictional genre (e.g., urban fantasy, period with specified century), technology level, whether or not there is magic, whether that magic is known throughout the world or is a secret, and your top 5 major ways not included in the above where the world departs from RL. Using Star Wars as an example: "Space opera sci-fi, extremely advanced technology including FTL travel and cloning and laser katanas, sort of magic led by a 'Force', that is in everyone and everything, kinda like energy. A few select people have psychic abilities, they're called Jedi. people know about the Jedi but there are so few they're kind of a legend. Some weird things are: aliens, this takes place in a universe far far away, Ewoks are adorable, good and evil are pretty sharply dichotomized, etc"
Keep it to what's meaningful to your character, as much as possible.
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Using bullet-points would be a good option to summarize further whenever necessary. What matters to us is to know what frame of mind the character will be in when coming to Xist, and why they've got to that point. For the worldbuilding, summarize the world with a focus on fictional genre (e.g., urban fantasy, period with specified century), technology level, whether or not there is magic, whether that magic is known throughout the world or is a secret, and your top 5 major ways not included in the above where the world departs from RL. Using Star Wars as an example: "Space opera sci-fi, extremely advanced technology including FTL travel and cloning and laser katanas, sort of magic led by a 'Force', that is in everyone and everything, kinda like energy. A few select people have psychic abilities, they're called Jedi. people know about the Jedi but there are so few they're kind of a legend. Some weird things are: aliens, this takes place in a universe far far away, Ewoks are adorable, good and evil are pretty sharply dichotomized, etc"
Keep it to what's meaningful to your character, as much as possible.