The funny thing in this situation to me anyway is that the character literally IS a Sonic OC recolor, but anime. It is hypocrisy in of itself for Rev to bitch about it, because as he often says, it is a fictional character (and in this case fan fiction, Brazillian Miku is literally a product of bored Twitter artists, there is nothing official about her). And as you said, just acknowledging underage people exist is hypocrisy to Rev. His mindset is that either all of it is ok, or none of it is. The nihilist mindset, black and white. The simplest way out is just to say Brazillian Miku is a different charecter than regular Miku and is a adult, like everyone on twitter that is drawing her is saying. Rev however twists himself in knots, because, well, he likes kids. 18 is a bit old for Rev.