So hear me out. What if all the Ikemen games would only have one and same main character? Like the mc would be like the mc from Lovebrush Chronicles, that she is able to travel not just dimensions but time too?
First time her doing that could be when she ends up in the world from Ikemen Revolution, where she learns the steps a bit, maybe from Blanc?
Next time when it would happen she could end up in Ikemen Vampire. I think she would be like, oh this shit again. When she would be in there in the mansion she would actually start getting more interest of the history and to actually start studying everything she can about different eras ect.
After Paris she would be visiting Japan where she would end up to Ikemen Sengoku, where when she starts to talk to Sasuke she would be just laughing to him from the beginning, that, "not my first rodeo and not probably my last one either."
Of course, we can't forget Ikemen Prince, i mean, how much do we actually know about mc's past? Yeah, we know about the bookstore she works and her boss being traveling a lot, so i think that would give perfect way to her to actually be traveler too.