Official FF6: Beyond Chaos thread (randomizer)

Hey Everyone! I absolutely love randomizers and FF6 Beyond Chaos is super fun to play. I had a question though. I watched the permadeath playthrough and some other runs and some of the sprites were custom from either other rpgs and other final fantasy games. Now are these already included in beyond chaos or do they need to be added somehow? I would love to hear back from you all. Thanks!