I’ll go first.
What if we do get to choose our lives and who we will be before we are born? And what if some of us have lives that seem a bit extra hard because we chose it that way? Maybe we kicked way too much ass in life during our previous 10 lifetimes and we thought, I’m amazing at this, it’s too easy, I’m getting bored, Please give me a few mental spiritual physical or social handicaps so I can at least stay awake during the next run.
What if on most planets people never really die. Everyone is immortal. Or they just respawn to the nearest temple and keep on going, no memories lost. And what if everyone on this planet chose hardcore mode where you can only die once and then all your memories are erased when you start again because we were all hard bastards that were just way too good at living.