This is Amitie. One of the 3 lead roles. Amitie is a cheerful, female citizen of Primp Town (a town from the Puyo Puyo universe. She is very naïve, as she is often immature, and sometimes does not understand simple jokes or puns. 

This role is a voice replication role where the VA tries to replicate the given voice. 
The voice you are trying to replicate is here
If you cannot replicate this voice try this one (Up to 0:44)
If you can't replicate any of these, try your best to sound like an innocent and immature preteen girl from the early 2000's.