Does their personalities switched during the change from PC-98 to Windows?
I just watched some few endings, but i remember that Marisa was still carefree, the only difference is that she was evil in the second game. I also remember Reimu being less stressed in the older titles as well, besides that, i don't think so
Marisa is still Marisa, but Reimu is more laid-back than now. And I don't think Marisa is evil in the second game, it is just Mima is her master, so she takes her side. She befriend Reimu right after the game and help her train(in some torture manner tho)
There is a music video named 【Touhou Project】Maidens' Capriccio, that have a lot of illustrations from this author. The video is too long so i can't archive it on this website, so i just mention it here in case someone interested it.