Makes sense to me. I don't think anyone would take exception to a Mario pic that includes FLUDD or the Luma that follows him around in Galaxy. Same deal. Hell, I know for a fact at least one Samus pic has a Metroid in it, and that's not even part of her... powerset, if you will.
...The bigger issue is, IIRC, there's nothing to suggest Blue in the games even owns a Blastoise. >_>
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"The courtroom is the garden of holy judgment. Those with lechery in their hearts should leave this sanctuary at once!" ~Franziska von Karma