A user by the name of Buyatari has uncovered an interesting collection of materials, seemingly distributed by Capcom back in the days for various purposes. They include things like character model sheets, ad mock ups, and concept package designs. Lots of rare and fascinating stuff! Some of it gets pretty out there. A Mega Man 2 toy line? Ground Man in the Mega Man Mania box concept?? Mega Man X Soccer??? I would love to know the story behind how and why much of this stuff was made!
You can check out many more materials on this Digitpress forum post. Thanks for bringing it to our attention, Buyatari!