If you're looking for manga similar to Etotama, you might like these titles.
Koha-Ace stars Kohaku and features characters from various TYPE-MOON series. It is drawn in a super deformed style, and it is a self-aware series that constantly breaks the fourth wall.
Every year, Shu-chan makes his lover A-chan wear cute zodiac costumes and insists on taking pictures of his costumed lover. But this year, A-chan's had enough of the cutesy play and forbids him to pick anything cute. What is Shu-chan going to do?
Yu-Gi-Oh! D Team ZEXAL focuses on humor and all characters are drawn in a chibi style. Different from the canon series, aimed at juvenlies, this manga series is aimed at younger children, and teaches them how to play the Yu-Gi-Oh! OCG with a light and humorous plot.
Another version of the story of the Inspectors and Enforcers from Psycho-Pass, but this time in chibi style! All of the main characters are now in chibi form, and are attending a "Psycho-Pass Academy," which is basically a chibi-fied version of the scenario of the original series. New student Tsunemori and her classmates will use their Dominators to keep their school's peace!
The Twelve City, a land governed by the leaders of the families who bear in their names the Chinese zodiac. In a city where youkai and humans coexist, the cat youkai who holds a grudge against the Rat Family appears in front of Nekuni Kyouichi, the head of the Rat Family. It's a malice-covered Hateful cat who is aiming for his life. But that youkai is Nekogasaki Natsuho, who's also extremely anxious around other people... Just like the saying "Curiosity killed the cat" goes, will these feelings also kill the cat?