I'd recommend 'Strobe Edge'. It has a similar focus on the development of relationships and has charming characters, much like 'Hana to Usagi'.
You might like 'Ao Haru Ride', which shares some elements of sweet romance and character growth like 'Hana to Usagi'. It also has beautiful art.
It's likely a manga with a yaoi theme featuring characters named Hana and Usagi. Yaoi usually focuses on romantic or sexual relationships between male characters.
The relationship could be close or have some differences. It depends on how the adaptation is handled.
I'd recommend 'Sweetness and Lightning'. It shares the warm and gentle atmosphere of Usagi Drop. The focus on relationships and daily life could make it a good match for you if you like Usagi Drop.
They are quite similar. The anime mostly sticks to the main plot and characters of the manga.
I think 'Oyasumi Punpun' is somewhat similar. Both explore complex and sometimes dark themes with unique art styles.
Well, 'Girl Friends' could be similar. It also focuses on the complex emotions and relationships between female characters.
I'd recommend 'The Ancient Magus' Bride'. It shares elements of magic and a unique relationship dynamic like in 'Hana and the Beast Man'. Also, 'Fruits Basket' has a touch of the fantastical and emotional depth that might appeal to you if you like the mentioned manga.
It's quite similar. The anime of Takane to Hana closely follows the manga, with few noticeable differences.
You might want to check out Ouran High School Host Club. It has elements of romance and comedy like Hana Yori Dango. Both explore the dynamics of relationships among students in a school setting.
You could try 'Your Lie in April'. Both have elements of drama and explore complex relationships. The art styles might also appeal to you if you like 'Hana no Mizo Shiru'.