Just remix the project, then put your Oc (object preferred, but not needed) on an BFB team, simple as that, and finally add that Oc to the Team you've picked sprite and add it to the earliest costume possible.
Credit to @Super-BFB-Fan for the original project with BFB Team Logos, and Credit to @Project_Corrupter for making them. Optional Stuff To Fill In If Your Bored: Name: Personality: Likes and Dislikes: Flaws: Skills: