Karneval (TV), Servamp Recommendations
The things that Servamp and Karneval share are:
1. A cast of lovable and quirky characters
2. Bishounen overload~!
3. The main cast all have a close bond with each other and fight together for a common goal.
4. Colorful and crisp art
5. Gorgeous character designs.
6. Smooth and fluid animation.
7. Drama(Karneval is more light hearted but does have it's share of dramatic episodes and character backgrounds)
Overall, Servamp is darker and more violent while Karneval has more comedy and is more lighthearted, however, if you enjoyed one i'm sure you'll enjoy the other too!
Both these shows fall under the Josei genre, with loads of pretty boys whom the fangirls can ship to their heart fills. Both involve two main guys grouped into a duo. All in all, they have a similar aura and josei fans will enjoy the other if they've watched one of them
Kuro and Nai are adorable hybrid animals that have ear-like hair
Both have some creative psychological areas and subtle comedy
Both have two bonding characters: Nai and Gareki, Kuro and Mahiru
A "villain" has some association with the main character
Both are fantasy and Josei
Both have wonderful character designs and personalities
Many characters have dark pasts
Both main characters are carefree and joyful with a lot less enthusiastic partner