The listed Demon Slayer Xbox items carry Teen (T) and Mature (M) ESRB ratings.
Yes. The search results show Demon Slayer titles with local multiplayer options and listings that support online multiplayer.
The results show Demon Slayer titles spanning genres from board-game style entries to action and fighting games.
Player support varies by title. Some entries list local cooperative play in teams of two, and at least one listing specifies a two-player count.
One boxed collection notes a download is required and that the box contains a keycode; it also states an online account and a persistent broadband connection are required for online functionality.