Brienne

[RandomOreo]

So I didn't put Brint in the armor before going to KM because I honestly forgot anyway I can turn him into Brienne

 

[valk42]

no

 

[Tarnakus]

Not in game. It is possible via save editing. Move to somewhere away of Undermountain and KM - edit MAD_COW_KILL flag (assuming you never started the quest) to 0 or delete it.