Good thread, I was about to start an identical one (hence your thread must be good
)
I'm currently playing through Kotor 2 with Revan as a female darksider. In the first games I played, Revan was a female lightsider (to me, Revan is female, as is the exile, why should I look at a guy's bottom for an entire game?). I am not finished with the darkside Revan game yet, but here is the differences I have noted so far:
If Revan was lightside, Carth is an admiral in Kotor 2. If Revan was darkside, the admiral is someone named Cede.
If Revan is female lightside, Bastila doesn't appear after Carth has spoken to the Exile. As far as I know, she doesn't appear in the game at all for a female lightside Revan, except as a vision in the cave on Korriban.
If Revan is female, T3-M4 has a hidden hologram of Carth. If Revan was lightside, Carth appears in admiral's uniform and says something about Revan is planning to leave, and he tells T3-M4 to go look for help. If Revan was darkside, Carth appears in his old outfit and says that he can see Revan start to turn, but that he will try to save her. If he fails, he says, T3-M4 will have to search for help. T3-M4 implies he's dead.
If Revan was lightside, Kreia says something about the Jedi Council convinced Revan to have a change of heart. If Revan was darkside, she says something about Revan escaping the Jedi and take revenge on Malak, but stopping the campaing of conquest soon after.
If Revan was lightside, Goto (during his interrogations of the Exile) says something about Revan leaving, instead of fighting the new Sith threat. If Revan was darkside, he says that Revan stopped the campaing against the Republic. In both cases, he regrets the fact.
If Revan was lightside, Master Vandar died on Visas home planet Katarr (as I think it's named). If Revan was darkside, he died in the Star Forge battle.
If Revan was lightside, Kreia says something about Revan redeeming the ghost of Ajunta Pall. If Revan was darkside, Revan sent Ajunta Pall's spirit to oblivion.
If Revan was darkside, there is a Sith Holocron in the ruins of the Academy. There Bastila says what has happened to Revan and the Star Forge.
If Revan was female, there is a bunch of errors in the game, where she is called 'he'. These mistakes are made by the Jedi Council, Atton, Disciple and Goto, and probably many more I can't recall. I don't know if the converse is true.