I legitimately think the first video game to ever say the word “bisexual” out loud was Metal Gear Solid 2: Sons of Liberty. There is a nonzero chance it was actually the first video game to print “bisexual” in a text format.
It is very possible that the first video game character to ever say the word “Bisexual” out loud was Solid Snake.
Based on what I found, the first ever bisexual character in a video game was Curtis Craig from Phantasmagoria 2 (1996) but I have yet to find out if he says the word “bisexual” in the scene where this is revealed
He does not. He says he’s attracted to his male best friend but he never says the word “bisexual.”
The first ever character to ever correctly and overtly identify a person as bisexual was Solid Snake in Metal Gear Solid 2: Sons of Liberty (2001)