im gonna write a short review so here it is keroro gunsou is a slice of life/comedy manga it has some ecchi too(unlike the anime) you can read the Synopsis for more information about the manga STORY:8/10 the story for each chapter is interestingand funny in some sort of way
it has some good plots too

ART:7/10
i think the art improvement is really good from chapter to 1 to 50++

CHARACTER:9/10
i really love the character in sgt keroro
especially keroro himself
he's really funny and whacky
and the way he treat other are hilarious

ENJOYMENT:8/10
i really enjoy this manga
the sci-fi and slice of life is part is great
and the jokes are funny ( even though i don't get all of them)

OVERALL:8/10
i really recommend this manga for all of you who enjoy
Whacky and insane comedy with extraordinary events