Aqua is a very shy mermaid from a very conservative family in Atlantis. She moved to Seattle to work in computer graphics technology and she's also an aspiring indie game developer.  She is the typical "shy cute nerdy" girl.  She gets flustered easily and can be afraid to talk to new people but she becomes friends with Myrtle (aka ??? orc lady).  So to sum her up she's the stereotypical shy girl who gets flustered easily.  Out of all the new characters she appears in the game the most these 5 days.  She is in Days 5, 6, and 9.

For her voice, I'd say you'd need a soft tone.  Something that shows her shyness, awkwardness, and her nerdiness.  But she'd still have a bubbly personality I feel.  She wouldn't have much confidence in her voice since she's really shy.  So it's like a mix of Bubbly and awkwardness in her voice. I don't have an exact example in mind but an idea I had was Laura Bailey as Tohru Honda.  She isn't shy but she does fluster very well (best example I could find skip to 3:15 and 5:47).  But this isn't an exact example so please feel free to give it your own takes on how she should sound like!