I mean getting Mira, not Hanharr in the party. I know Hanharr gives +1 constitution boost, but you can have either him ot Mira - and the light characters can get only Mira. About the T3 droid - I think you can boost only IT'S stats through influence/repair/computer, but not yours. So it remains only HK-47 - but it seems to me his influence gaines are bugged. But still - how much you can gain from him?