NiGHTS is genderless, though I would prefer they had a voice similar to Jewels Jaselle (Julissa Aguirre) who used a more feminine voice for NiGHTS. Though a little boy-esque voice, such as Luke Triton (from Professor Layton) would also work!

I would also prefer NiGHTS to have a British accent, a posh London accent. 

NiGHTS lines for this video are also their audition lines, and unless any corrections have to be made, NiGHTS will not have any lines and the cast VA will have their audition used.