Tatsumaki has a rather brash personality and a typically moody demeanor. She is disrespectful towards most people, especially to those she deems incompetent, and is completely intolerant of disrespect towards herself, as shown when she pinned Genos to a wall for retaliating against her verbal abuse of Saitama. Tatsumaki especially dislikes being ignored or being called things like "brat" and "runt".

Any higher pitch female american voice will do I think. I try to put as little restrictions as possible on the type of voice a character should have, I like to give creative control to the voice actor. So trust your own judgement