So, I am currently in the process of creating a secondary protagonist character, but have yet to land on a decent backstory for them. While in the process, I got to thinking. If a character has a very boisterous and "loud", unforgettable presence, would it be necessary to flesh them out with a backstory, or simply implement them into the story and play off of their nature? If you think a backstory would be helpful, are there any ideas for one that you think would result in a character having that very strong presence? Thank you!