Even if the new character does turn out to be the trap I can only see it ending well. The Catherine and Katherine routes were Vincent coming to terms with his relationship. For all we know Vincent could end up accepting the new character being a boy and being totally fine with it. Erica was already represented in a positive light to begin with.
Also, trannies will get mad any anything and everything. >Trannies calling the new character trans even though it's more than likely just a cute boy who likes to dress up
THERE'S A DIFFERENCE BETWEEN TRANNY AND TRAP, TWITTER