I saw a post expressing some frustration with the state of f/f shipping in the Ace Attorney fandom, and there are definitely some elements they discussed that I agree with.
While I don‘t feel that FranMaya is exactly a “crackship” per se, I do agree that it’s overly represented given the amount of time that the characters actually spend with one another in canon (which is next to nothing.) The pairing is largely speculative and results from Maya and Franziska being considered as sidekicks to or subcategorized to to their male counterparts, Phoenix and Miles.
It definitely comes off as very “pair the spares” to me– specifically in I feel like the pairing got started more because people ship narumitsu rather than finding Maya and Franiziska as having any chemistry in their own right.
The post I read was unfortunate also correct that a large subsection of the fandom will go off if you do pair either of them with anyone else. There tends to be a low tolerance in the Ace Attorney fandom in some ways for shipping outside of the main top pairings– this isn’t unique to femlash, people will come at you for the wrong slash pairings, or het pairings also.
Franziska and Adrian Andrews was brought up, which is a pairing that I personally find very compelling, and plan to write more of in the future.
I feel like if Adrian was less of a “one case wonder” and got more screen time that this could have developed into a fairly common pairing.
Another pairing discussed was another favorite of mine, Trucy and Pearl. This particular pairing I think suffers from the heavy infantilization of both the characters.
While in the last game, Trucy is 17 and Pearl is 18, both of them are introduced to the series as children, which I think makes many fans hesitant to write them in any romantic or shippy material.
However, I feel like the best way to combat all of this is the same as combating most fandom problems simply to keep putting the material out there that you want to see, in whatever capacity you enjoy, be that fic, art, edits, meta or just talking about the pairings.