If you liked
Saiki Kusuo no Ψ-nan
|
...then you might like
Gokushufudou
|
Both are fast-paced comedies with five minute segments compiled into longer episodes. The characters are all very intriguing (batsh*t crazy), expect it's kind of reversed in the fact that the main character in Saiki is the sane one while the main in Gokushufudou seems to be the oblivious one. They are both produced by the same studio as well, but I believe Saiki was done a bit better. I highly recommend both because they're simply hilarious and introduce situations that should normally never happen.
If you liked
Kaichou wa Maid-sama!
|
...then you might like
Namaikizakari.
|
Both series revolve around a tough female lead and her troubles with a popular, affectionate boy who seems to like her more than she'd prefer. Both love interests are cool and sly, but in Namaikizakari there's a lot more, well, third base. Without being rushed, of course. Both stories have a more natural feel than most shoujos, and the female lead isn't a total ditz, but rather someone you can root for and actually relate to.
If you liked
Koroshi Ai
|
...then you might like
Sachi-iro no One Room
|
Both stories are psychological semi-romances with criminals for main characters. Sachi-iro no One Room is about a girl and her kidnapper, and their unlikely story which leads to codependency and struggling to stay together. Koroshi Ai focuses on a female bounty hunter who gains a murderous admirer/stalker who seems to know a lot about her past. Both are highly entertaining if you're into more mature, thought-provoking romances.
If you liked
Love♥Monster
|
...then you might like
Black Bird
|
Love Monster is kind of a rip-off of Black Bird, not going to lie. However, this also means that a lot of the elements you missed from Black Bird can be found in this manga. Both love interests are tengu, and the main character is 'special', which causes a bunch of romantic tension, yadda yadda. While Black Bird had an overall better story, I feel like Love Monster also has something worth reading to offer. Just watch out for that ending. Yikes.
If you liked
Noragami
|
...then you might like
Jibaku Shounen Hanako-kun
|
Both have supernatural and romantic elements with comedic moments to break the tension. There are also themes of horror, which is especially great from Hanako-Kun because it juxtaposes the 'moe' art style. Both main characters are suddenly thrust into the supernatural world, and the love interest is one with amazing powers who has to protect/fight/ etc.