Look at all of the candy cane stripes.

Rikki on Rikki. Hawt

Lol got re-tagged as Derpah

gawds, yes! <3

How about adding the dickgirl rikki for a threesome

Go fuck yourself...

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You doin it yet?
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Good.

... This is actually quite accurate to what I've found in Rikki's tag; Rikki seems to be male and female at the same time. And sometimes, Rikki's a dickgirl.

And I haven't found any sort of crossgender tags for Rikki other than four images, but everywhere else where Rikki is that gender, the tag isn't present. And getting into the wiki page for rikki says that Rikki is female canonically, but it then mentions "Generally drawn as a female, other times a dickgirl.", implying that female isn't the canonical sex. So it's like the character is without an official sex.