Ryoko is presented a girl with a neurological disorder which causes her to lose her short and long term memories. Because of this, she writes everything down in a notebook, the 'Ryoko Otonashi Memory Notebook', While she has loisther ability to form new memories, she still has her ability to remember and learn 'procedural memory' tasks such as writing and reading.

Ryoko is generally carefree, with a "natural cheerfulness". SHe has a rather eccentric way of thinking, which is not expressed to be related to her disorder. She is said to have a strange laugh. Because of her forgetfulness, she has trouble concentrating and may come across a bit dumb in to other people's eyes. She may often appear uninterested and may fail to respond to situations properly.

(Ree-oh-ko Oh-toe-na-shi)

Character Wiki

While this character was never formally voiced *cough* *cough* we can assume her voice would be slightly ditzy, but also somewhat composed; not stupid but also sorta soft-sounding. 

Vocal Range would probably be mid to mid high.

Feel free to do you own interpretation though!

Notes: Please read each line 2-3 times with no slate. The third line is the most important though as it's part of the actual dialogue you'll be speaking if you're cast.