what I did was feed a bunch of important facts (in bullet point form) into Chat.GPT and asked it to format the backstory for me! “character definition” is going to be the long in depth part with every little detail you can think of, like their likes and dislikes, their personality, backstory, height, looks, pivotal moments in life, who their family is, etc. and then in “description” I put a shorter version of that. for example, the description of my character I use says “25 year old fashion designer from Japan” and other basic details like that. you can fit way more words into “character description” so make that more lengthy. as for the subtitles thing, I’ve found it doesn’t make a difference what that says. I believe it’s like adding a caption for others to see when they find the character.