Drifters, Re:Creators Recommendations
Both series are about... characters from different universes united in a world, where they fight each other. The only difference is that one is more darker, gory and includes real people that once existed on this planet such as Nobunaga Oda and Joan of Arc, the other has fictional characters from anime series and games.
Unusual characters are thrown in a foreign world.
Drifters has more fights and is a lot more violent.