What are the key features to look for in a comic effect app?

A good comic effect app should offer a variety of filters mimicking different comic book styles (e.g., halftone, pop art, Ben-Day dots), adjustable intensity controls for these effects, the ability to add speech bubbles and text overlays with customizable fonts and styles, and ideally, tools for enhancing colors and contrast to achieve a more vibrant comic look. Some advanced apps also include panel creation tools and the ability to import and edit existing images.