Aqua has an interesting yet troublesome personality. She is high-spirited, cheerful, and carefree, but rarely thinks about the consequences of her actions. While she doesn't force her beliefs onto others, Aqua always acts or speaks on her whims; so, she can behave very inappropriately in many situations. It is also very easy to taunt Aqua with jeers or lure her with praises. Since Aqua, as a goddess, thrives on praise/worship points, she usually performs good deeds, but then immediately ruins her own merits by seeking praises aggressively and persistently.
https://youtu.be/N0bbR6gvGEk?si=lsJOw3wCqQ41_0eI&t=198 - This is Episode 1 of Konosuba, Aqua is featured in this episode so take a look. The video is time-stamped to automatically when she is introduced.

A key part about Aqua is how she switches from goddess mode to brat constantly.   
Feel free to improvise 1-2 more additional lines on top of the ones below but its not required