Well - known DC characters like Batman or Superman, if they play important roles in the story, are always memorable. Their interactions with the transformed character, whether it's as a mentor, an ally or an adversary, add depth to the story. For instance, if Batman helps the main character understand the dark and gritty side of the DC world, it can create some truly engaging and memorable scenes.
The main character themselves would be very memorable as they are the one experiencing the transformation and all the challenges that come with it. Their journey of adapting to the DC world makes them stand out.