Sayori's voice is a bit higher in pitch and can give a bit of an 'airy/clueless' vibe. She will be keeping her canon age of 18.
Personality wise she comes across very similar to her base game self with being very clumsy and normally unaware of how others reactions while thinking everything can be fixed if you are optimistic enough about it, however this is mostly a cover up. Her true personality still has as very bubbly attitude but is a lot more 'realistic.' She is also a lot more aware of others and the clumsiness vanishes completely.

Her skill is that she is a very accomplished 'medic'... for ailments that are not really known to the general population.