>>17144765
>ESPECIALLY not ZUN
Your emphasis is weird and kind of wrong. Reimu's personality is fleshed out fine, but done by using many different perspectives. It's that the perspective we don't have is Reimu's own, so we never see the world as she sees it. ZUN is also not able to see things as Reimu sees them despite writing her, mostly because she is someone not quite like other humans and also not quite like non-humans, so getting inside her head is tricky. Her personality is besides that aspect of her and is quite visible, despite being multifaceted and sometimes hard to pin down across different works.