Is Ika Musume the only humanoid squid creature?


In Shinryaku! Ika Musume (Squid Girl), the protagonist is a strange creature
called Ika Musume who looks almost like a young girl, but has a number of
strange squid-related abilities, such as spitting ink and using her hair as
tentacles. She is also intent on invading humanity.

Are there any similar squid-like humanoids in the series, or is she the only
one of her kind?

![enter image description here](https://i.stack.imgur.com/eNmjE.png)




As far as I know, she's the only squid-like humanoid shown in the series.
Though there is a miniatured version of her that appeared on people's dream,
mostly Sanae's ([source](http://en.wikipedia.org/wiki/Squid_Girl)). In the
last episode of Squid Girl, she met a girl named [Kozue
Tanabe](http://en.wikipedia.org/wiki/Squid_Girl#Kozue_Tanabe) which is implied
that she also comes from the sea, as she has a hat similar to Squid Girl's and
makes statements that indicate she isn't human. The first syllables of her
name spell out 'tako' (たこ?), meaning octopus.

