When it comes to doing a blurb, you want something that gives the reader enough information to get a reasonable sense of what they're getting into, but also gives them enough of a hook that they want to find out more. And I went through a similar thing with my blurb. Here's the original version (as I recall) that went up:
For over a century, fictional characters have been falling out of their stories into our world. Some want to go home. Some want a new life. Some want to meet their creators. Some want justice for their suffering.
And one will fight a bloody war to liberate them all.
After a bit, as I was preparing the print and e-book editions for pre-order, I realized that it had a major problem: I had gotten the concept across, but I given the reader absolutely nothing as far as who the characters are (and, in the end, it's the characters the readers will care about). There's real merit to the phrase "less is more" when it comes to writing copy like this, but you still have to give the reader enough information to get their bearings. "More is more" is also true.
So, then I added some information about the characters, and it became this:
For over a century, fictional characters have been falling out of their stories into our world. Some, like mech pilot Atria Silversword and isekai protagonist Daiki Yamato, want to go home. Some, like JRPG non-player character Princess Stellaria, want a new life. Some, like superhero Captain Infinite and devil king The Destroyer, want to meet their creators. Some, like monster hunter Jenny Calhoun and super-assassin Jack Death, want justice for their suffering.
And one will fight a bloody war to liberate them all.
And that is what got locked down for the back cover blurb.
Just looking at what you've for the new one, there's a lot to like about it. You give us a sense of who the characters are, where they are coming from, and where the story is going to go. Really, the only problem I see is that last word. In the original, the double-entendre was balanced out in the description due to the context of taking the merman home, but in your new version it isn't...and it kind of reads like the description of a porno as a result. So, tweak that last word, and you should be golden.
(I didn't sleep that well last night and my coffee is still kicking in, so I'm afraid no suggestions for a replacement word are coming to mind...sorry.)