I googled mypaint, and found that is is also available for windows, so I might try it oneday,
but I think MyPaint is not a vector editor such as Illustrator, it would be more like Photoshop or Corel Painter.
Below are some pictures of softwares google relates to the search for MyPaint, looks like these are mostly pixel oriented, only Inkscape is a vector editor ( making scalable vector graphis or SVG ).

Krita, I do not know personally, but it looks Japanese or?:

A very very good program is ClipStudioPaint, very good for making complet comic books, very Manga oriented, very powerful; you need the pro version, not cheap...