So if it isn't your thing then that's cool but I figure since you're sort of poking around it would be good to offer ryslig! Ryslig is a horror game, and at the moment aside from numerous characters from some of the other Yu-gi-oh series, there is also of course this kiddo here (Noa Why) and...
'C. Seto Rosenkreuz' AKA Seto from that really weird game way back. So considering the differences there it could be something worth even poking around on the TDM for. (On a more hilarious note, Bleach's Ichigo was actually perma-killed when the one that was there dropped, so that could always be interesting if you wanted to play with that.)
I can also hesitantly offer cosmographia, and I say hesitantly because technically there is a lot of slice of life, with the game's events being monthly and not necessarily monster-battle focused. Cosmos is a game set in a Steven Universe-like world, where everyone arriving is given a gem, some powers..fun stuff.
It's also very open to player plots however, which is why I said technically up there--because while not much may be going on with the game's official business, chances are there will always be something to do with a battle or similar in the player plots. And if Canonmate Shenanigans are your thing, Ushio from 5Ds is there, and considering it was confirmed that Ushio from that series is the same as the one from DM...
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So if it isn't your thing then that's cool but I figure since you're sort of poking around it would be good to offer
'C. Seto Rosenkreuz' AKA Seto from that really weird game way back. So considering the differences there it could be something worth even poking around on the TDM for. (On a more hilarious note, Bleach's Ichigo was actually perma-killed when the one that was there dropped, so that could always be interesting if you wanted to play with that.)
I can also hesitantly offer
It's also very open to player plots however, which is why I said technically up there--because while not much may be going on with the game's official business, chances are there will always be something to do with a battle or similar in the player plots.
And if Canonmate Shenanigans are your thing, Ushio from 5Ds is there, and considering it was confirmed that Ushio from that series is the same as the one from DM...