I completely understand why trans women are upset about the current tagging situation - it can be annoying seeing a character who affirms you tagged incorrectly. I think the issue here is that it's a battle between two groups: people who liked Bridget before, and people who like Bridget as she is now. Personally, being an otoko_no_ko fan, Bridget being trans has made me have no more interest in seeing her when I search for the otoko_no_ko tag, as trans women are not what I'm searching for. I'll side with the people who want to bring back the transgender tag or add transgender_(mtf) as a tag, in addition to using it specifically for her appearance in Strive. I feel acknowledging a character's gender indentity in spite of what they were assigned at birth is the correct thing, i.e. tagging Bridget as 1girl with the transgender tag, and extending that to all characters who identify as female but were AMAB.
The two-tag limit for most users would mean people could just search for bridget_(guilty_gear)+transgender and get all the images that acknowledge her as such, while also not invalidating those on the Japanese side who consider her otoko_no_ko, i.e. a male who physically appears to be female or appears feminine. The unfortunate fact is that Japanese online culture is kind of clashing with current western cultural values here, which means Japan basically still considers her a boy in spite of her current gender identity and it'll take a while for people to acknowledge that. Heck, Japan was treating Lily as an otoko no ko when it was revealed she was AMAB. It just is what it is and we should work to try and acknowledge the current lore without invalidating people for what they identify as. (That being said, I wouldn't necessarily be opposed to keeping her tagged as 1boy due to what she was assigned at birth, as this is a complicated situation that has to deal with TWYS as a policy. I'll leave that decision to you all to take care of.)
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