Tone: boisterous, loud, snappy, tough.
An example of what we're looking for is similar to Akeno Himejima from High School DxD (warning NSFW):
https://www.youtube.com/watch?v=48g-rQmLPQA

President of the Occult Club. Boisterous, opinionated and headstrong, Ember has a reputation of being a delinquent despite her position. She is incredibly passionate about the mysteries surrounding Komachi, and is hell-bent on bringing these cases to light, no matter the obstacle.