To create a memorable Scott Pilgrim oc, think about their backstory. A tragic past, like losing their family in a video game - related accident, can add depth. Also, consider their relationships. If your OC has an unrequited love for one of Scott's friends, it can create interesting storylines. And don't forget their motivation. If they are motivated by a desire to avenge their sister who was wronged by one of the evil exes, it gives them a clear goal and makes them more relatable.
One idea could be an OC who is a new roommate of Scott. This OC could be from a different dimension and has unique powers that start to affect Scott's daily life and his battles in strange ways. For example, the OC's power might accidentally make Scott's enemies stronger or change the rules of combat.
One common theme is self - discovery. The oc often goes through a journey of finding out who they are within the wacky world of Scott Pilgrim. Another theme could be friendship. They might form new friendships with the existing characters or even mend broken relationships. Love is also a big one, whether it's a new romantic relationship with Scott or another character in the story.
Scott Pilgrim was indeed a comic first. It had a dedicated fan base from the comic world before branching out into other entertainment areas. The comic's success paved the way for its expansion into various mediums.