Make T3 An Actual Character
I was actually thinking of doing something like this after my next K2 playthrough, to make sure it's (his?) character remains consistent.
My full idea would include a potential retcon for T3, to help develop a backstory their character in a KotOR-like manor. In KotOR T3 is supposed to be a brand new droid, and this could easily be used to explain it's non-existent personality, since it hasn't developed a distinct personality yet. The retcon would change that somewhat.
It is explicitly stated in the game that Davik commissioned T3 so this opens up some options. In my idea T3's memory core was a stolen Republic code breaking droids core that was partitioned, rather than memory-wiped, to preserve it's high level code breaking capabilities, while suppressing any undesirable memories or loyalties. Revan could use Computer Use to unlock new memories and abilities in much the same way as using Repair on HK. This would also be a good excuse to give T3 it's quirky personality rather than a fresh-off-the-production-line default.
Like many characters T3's backstory would involve the Mandalorian Wars and tangentially Revan, to help create a connection between the two, rather than just "I own you, do what I say".
Of course that would all be optional dialogue. Just giving T3 some more dialogue and interactions independent of that would also be part of the mod, assuming I can wrap my head around the scripting necessary. Since the level-up unlocking of dialogue is used for the other characters I think I could basically just copy-paste simple scripts like that, and adding T3 interjections to dialogue based on whether they are in the party or not is mostly just finding the right dialogues in the first place. Inter-party dialogue is a different matter, as it would largely necessitate unused or forgettable dialogue from the other party members to avoid repetition. But there isn't a lot of this in the first place, and if I remember correctly I think it only takes place on Taris. Although it was years ago, I have worked on building dialogue trees before, so I am sure I can do that.
If you have any specific requests or concerns let me know, and I'll keep them in mind while working on this.