As an aspiring writer, I believe no good advice should go to waste, so I'll write them down here so you folks can have them too.
1). Character-specific Behavioral Quirks To Express Their Experience
As writers, we should express the most by doing as little as possible, so what better way is there of letting the reader know exactly what the character is feeling, thinking, or experiencing, than having the character posses a quirk that let's the reader know exactly that?
No need to explain anything more than once. If you've done it once, then the character's quirk may do the rest of the job in the future.
(Thank you <3)
Comment: I may add more advice in the future as I talk to more writers.