AI Personas & Characters is a mobile app available on the App Store for Apple devices like iPhone, iPad, and iPod touch. It assists users in making informed decisions by offering reviews, customer ratings, and screenshots. The app's core function is to provide a variety of AI personas and characters for users to download and engage with, although the exact number is unspecified. These AI personalities and characters come with predefined attributes and behaviors, simulating human-like interactions. However, the text doesn't mention customization options or the ability to create or modify these personas. In essence, AI Personas & Characters primarily serves as a repository of pre-designed AI personas and characters, offering users the chance to explore and interact with them on their Apple devices, making it an intriguing choice for those interested in AI-driven interactions.