 If you liked
Shinryaku! Ika Musume
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 ...then you might like
Youkai Watch
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Sudden dark humor!
It's a bit more rare in Ika Musume but it, just like Yokai Watch, occasionally has these sudden moments that make you think "Wait what." Especially when it's so casually played off.
You wouldn't expect it from a colorful and childish looking show like Yokai watch but it deals with cannibalism, suicide, murder and many more topics presented in a fun and child friendly way.
Ika-chan is kind of like a mix of Whisper and Jibanyan personality wise now that I think about it. Heck she would probably totally fit in the Yokai Watch cast.