In my personal opinion a good approach would be prior communication between the players involved. Discuss it beforehand, Order obviously needs to reveal true colors of some characters to fulfill their roleplay, but so are Wild/Aoi need characters to remain unrevealed to fulfill theirs. I feel it should be a matter of mutual agreement between players and be understanding that sometimes a player of unmasked character has RP already in works with other parties that relied on the fact remaining unrevealed, because once done so it becomes difficult or just impossible to reverse that. It is after all same thing as infesting another character - both need to agree, else it's a powerplay, same applies here. As naive as it may sound I believe that it must be a case of player agreeing on how and when that happens. Just don't do it in spite, that will only lead to nasty drama.