If you liked
Ningyo Series
|
...then you might like
Mao
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While the time travel and cursed demon boy make Mao seem the most similar to Inuyasha, it also shares many similarities with Rumiko Takahashi's Mermaid Saga. Mao has a much more serious tone with very little comedy similar to Mermaid Saga, where Inuyasha manages to stay light. Both Mao and Mermaid Saga also center around immortality and its consequences, with the main characters being immortal and encountering other immortals on their journey. The mystery cases in Mao are similar to how Yuta and Mana look into suspected mermaid flesh eaters. The main differences between them is that Mao has a serial story and is more action adventure based, while Mermaid Saga is episodic and leans more into horror aspects. If you aren't a fan of Takahashi's comedy or enjoy the dark tone of one series, you may like the other.
If you liked
Tegamibachi
|
...then you might like
Violet Evergarden
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Both series are very similar in terms of structure and theme. They both involve letters that are the embodiment of the heart and thoughts of the person, have the protagonist as a postal worker of some kind, and tell emotional stories involving the letters and their senders or recipients. Both have differences though. Tegami Bachi is about delivering letter, while Evergarden is about the writing of those letters. Tegami Bachi is more shounen adventure/fantasy based while Evergarden is more grounded in reality. The protagonist of Tegami Bachi, Lag Seeing, is very emotional while Violet starts off as very stoic and unemotional. However, the core concept of emotional stories involving "letters of the heart" is so deeply integrated in each series that the differences just serve to make them distinct from one another rather than separate them completely.