HIIII so I don't know who's gonna see this since basically nobody knows what Servamp even is and most would migrate towards the anime instead of the manga anyway, but I wanted to write a review for my favorite manga!! I'm gonna try not to be too biased here because I've loved Servamp for a long time and it has a special place in my heart, so rambling is plausible and I apologize:)) okay here we go

Story: when I had heard of Servamp, I went and watched the anime and left it at that; there wasn't anything special, and the story was odd and didn't make much sense. I don't remember how I decided to read the manga but I think I rewatched the anime and one of my friends told me that the manga was better, and so I read it and yeah, they were correct. Servamp is one of those stories that gets involved rather quickly, which could be hard to catch on for some people, which is why I'm rating it an 8 story wise. I'm completely caught up with the chapters, but it's kinda jumbled right now going back and forth between perspectives and etc (currently at chapter 102.)
The contrast between the anime and manga is that the anime left out a whole arc between the first season and the movie, and it slapped one of those "fake endings" on the last episode since the manga was nowhere close to being done, and I guess it didn't get enough hype for a second season. The movie is even altered because that arc was supposed to be between episodes 5 and 6 so they added in characters originally not in it and it literally didn't make sense at all. Long story short, the anime ended around chapter 40 of the manga, but left out a whole arc in between. Read the Servamp manga first if u wanna watch the anime:)
The story arcs develop the characters SO nicely, even though the main story is hard to grasp to.

Art: This shouldn't be as difficult as the story section was lol. The art for the Servamp manga is really pretty in my opinion. I've been following Strike Tanaka's artwork from the manga and on her twitter account, and she does a really good job. I absolutely love the character designs because of how unique they are and the artwork on some pages where fights are involved is beautiful. It's not very difficult to tell what's going on, which is a problem in some other manga when there is just too much on one page. The art is also fairly consistent, but gets better and better as the newer chapters come out.

Character: I can't say as much as I'd like here because there is just so much going on with every character and y'know spoilers, there are a lot of em. I think that the characters in Servamp are all very unique. Not many of them are bland, if any, especially since we have gotten to see some of the side characters more in action in the past 20 chapters or so, plus a couple new ones that have been introduced! As I said before, the character designs are all so different and I happen to like them a lot- even Mahiru who's the simplest, but that's who he is. I believe that Strike put good amounts of thought into these character's designs to match their personality and past, and the servamp's as their respected sin (psst, the 8 servamp's represent one of the 7 deadly sins plus melancholy.) This aspect of the character I think is really cool, even though it's not unique as it's in Fullmetal Alchemist, Seven Deadly Sins, and others I assume, but the fact that they have animal counterparts is a great spin on it. Altogether, I'm giving the characters a 9, just because some characters could have a little more focus on them.

Enjoyment: Y'all I don't write reviews often so I can't not bias this one much, but I will say that my favorite anime genre is supernatural and like vampires/demons and Servamp has got you covered on that if you're like me. I also really enjoy how most characters have gotten great development so far, and they're still adding new characters but aren't forgetting about old ones, especially the antagonist who has completely changed from the beginning of the story and some traitors and etc... it's also nice how Strike doesn't hesitate to kill off characters either, but don't worry too much :)

Overall: Again, biased, favorite manga, and I absolutely recommend reading Servamp. It's so underrated and I bet that if it had more exposure it'd be more popular than it currently is. And remember to watch the anime after reading <3