If it helps, Xiera is a CAST created relatively recently to be... exactly what she is. She's basically a super genius infant created to be your happy-to-serve tech support. The voice is a part of that, even if it is irritating. Xiao (the entity that created Xiera) doesn't 100% understand humans and how they naturally behave either. So it makes sense he designed her to be "very personable" without a clear grasp of when "pleasant" crosses over to "annoying".
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