This looks amazing, And I understand why you wanted to only use d6s for the game. But will you guys ever make a version that could be compatible with the dnd system, like a full set of dice, or even with the dnd class system in place?
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I'm not a designer of the game, I haven't even read the rules, and I'm really only on here to send to my friend who likes Hollow Knight, but I can probably answer your question; No.
One of the bigger appeals of d6 games is that almost anyone can use it. It's a lot easier to convince someone to play a TTRPG if they use a common 6 sided dice. Mainly because they aren't worried about the number of sides of a dice, and also buying a bunch of polyhedral dice can be really expensive, and people don't have the time or resources to try and get them. If you really want to play the system with the standard 7-set dice than go ahead and hack it! I'm not sure how easy it would be, but I'm sure it's at least possible.
As for the class system, I very strongly doubt they'll straight up add something like that, if they wanted it they would've included it when designing it. The D&D class system can be fun, it has it's merits and all that, but invokes a specific style of play; of less skill and strategy based, and more accumulation and growth based. Not inherently bad, just probably not what they're looking to add in a Hollow Knight RPG.
Anyways, looking from the comment, it seems like your new to the TTRPG scene. Welcome! I don't speak to many of the members, but the few I've talked to are really nice. I implore you to stay around and read some more games! TTRPGs are one of the most beautiful and interesting forms of art, and I'm glad to see someone expanding their horizons. :]
I am sorta new to the scene, though one of the main reasons I was wondering if they'd make a compatible version is because dnd 5e is the main big system, and honestly what I find to be easiest to use. So finding a ttrpg for a game I love is great, but some may find it hard to learn new things for each variation. (also in my opinion the class system in and is in for a long overdue makeover anyways) I never wanted to change how most of the mechanics work, but something that would work with dnd 5th would be great so that I can bring my little bug character along the adventure with a human fighter and orc barbarian.
Gonna be honest, my man, you're *probably* going to struggle to find a DM that will allow a Hollow Knight character in their game. And even then, you're going to have more luck just reskinning current stuff in 5 or upcoming 5.5e.
Hollow Knight has a very different magic and melee system from DnD, and a ttrpg that replicates that is going to be so different, by default, that its just not worth even considering system compatibility with DnD.
Short answer: No.
Longer answer: It would be far too much work for a team who only works in their spare time, and for a purpose which was never intended and never will be. It's a system for playing bugs in a bug world. If you want to play bugs in DnD you're gonna have to make your own homebrew for it.