These are really cool looking!
I don't think there will be a problem getting SEGA fans to enjoy these at all, remember there is the entire asian market (Hong Kong, Korea, Taiwan and Japan) which will eat this right up.
They got the designer of Hatsune Miku (KEI) to design these characters (you will notice the Sega Saturn bears more than just a passing resemblance to her
) This alone is big news, sure to be raise the popularity of it a lot amongst KEI's fans.
Light novels are actually a type of short-story novel though, not Manga!
There are plenty of fans of this kind of thing in the "west" though, Hyper Dimension Neptunia has well over 20 000 likes on Facebook.
Another great thing about this is it will draw in fans of Japanese pop culture who previously held no interest in SEGA's older consoles.