Honestly the characters are bland. Main character is so Mary Sue and overpowered it just seriously gets to predictable as the series progresses. Barely anything is a problem for our main character it's so bland.
The supporting cast are into, what I can see, into 2 categories: Dumbass and boobs
Seriously nearly any female character is depicted with either giant boobs or "flat chest"
Their only contributing is to fall for the main character without any rhyme or reason.
I feel that the only support characters with any development are the Male characters. And they are ok, but not enough for me to care to much about them.
And while the fan service isn't all that much here it is pretty obvious when it gets on screen.
If you like more developed characters, even the support cast, then I would recommend you rather watch Log Horizon. A good isekai story with enjoyable characters that is actually believable
