10 Game Crossovers That Need to Happen
Onimusha/Shin Megami Tensei
Demons. They come in all shapes and sizes. Some try to eat you, others like to have a nice conversation. In Onimusha, you play as a samurai that kills demons and absorbs their souls using a gauntlet given to you by the 12 Oni Gods. In Shin Megami Tensei, you must communicate with demons and convince them to join your team. You then use them to fight against other demons. In both series, you see demons as intelligent beings. They talk to you, threaten you, and try to kill you. Shin Megami Tensei takes place in modern or post-apocalyptic Japan while Onimusha has spent most of its time in Sengoku Japan, excluding the time travel plot of the third title.
Now, these games are different genres, with Shin Megami Tensei being a JRPG franchise and Onimusha being an action-adventure game. If they were to crossover, using the combat system from Shin Megami Tensei would make the most sense.
The best way of having these series crossover is reusing the time travel plot from Onimusha 3. Samanosuke is sent into the distant future, a la Samurai Jack. You can even put him in one of Shin Megami Tensei’s post-apocalyptic timelines. Samanosuke can meet, communicate and fight with demons from the Shin Megami Tensei games in an attempt to return to his time.