Honestly, if Kiara doesn't like it or gets tired of it, she might think she boxed herself in a hole with that kind of voice but people change all the time. I think the most famous off the top of my head is Flare, who used to have a lower voice, cool persona that she was doing in the beginning. And she changed her voice, little by little by little. Over a long time where it wasn't noticeable, she is definately more open I think is the right word compared to the past. Or just change it right away like Suisei who went with a deeper voice, Towa recently for one stream.
Some other members dropped verbal ticks like Rushia's nanodesu and Nene's aru? or something. For me, that laugh is a little rough at times. As long as she's happy I guess that's all that matters, I can tune out a lot and go internal.