Nanakawaichan
In terms of character design, I can't really say much. The story is currently too short to have a very good picture of the characters. One thing I can say though is that the characters aren't dumb harem protagonists, they actually behave like normal people. Stability of updates good, but the author has too many stories, so they're slow. World background is awesome, reason for reincarnation finally has some form of logic.
Finished this novel yesterday but forgot to review so here's one The Writing Quality doesn't have any major mistakes that I've seen but there might be minor ones that I missed The story Development is detailed and planned which I like, while the Update Stability isn't the best but at least the chapters have a lot of quality. The World Background is revealed as the story goes on, interesting things happen while some other things are yet to be revealed.