There's a fairly sizeable Gintama cast in Little Hades! They already have Gintoki, but I'm sure they'd love Sasaki (and could possibly convince a Nobume playing friend to join in too, I know they have some).

The game is mostly SoL set IN HELL, with lots of opportunity for hilarity and Shenanigans (and grimdark stuff if you're into that). It's definitely backtag friendly and on the slower side, though it can vary player to player and depending on timezones.