So far as the series progress I can see Jubei and Ragna training Lelouch in fighting though in Ragna's case beating the crap out of him until he gets stronger. This would mean Sector Seven is joined in with the Black Knights that includes Makoto, Mai, Noel, Lambda and Iron Tager. This would be a second battery for the Sakuradite as such Lelouch has more firepower to combine, plus Kokonoe is a more sassy version of C.C and Lelouch would get along with her ( Wiggle eyebrows). Thus began the new version of the Black Knights, for more of the members I can see that Lelouch would realise how outmatched he is and who knows finds Kokonoe they both strike a friendship (of sorts) and since Lelouch shows his Knightmare Frame where Kokonoe gets interested and puts in Ars Magus into it as an extra back up device. Since Ragna is out destroying N.O.L bases on his own Lelouch would probably recruit him into his group after some arguing since their goals align such as Ragna wanting to destroy the N.O.L and Lelouch wanting to make a better world. That's one side of a bad ending for Lelouch and for the BlazBlue world but on the other chances, if he meets Ragna I think they might get along since both of them have a strong bond and would do anything for their little sister (Nunually for Lelouch and Saya for Ragna).

Now Relius has the code and maybe he gives Hazama AND Terumi both a Geass? Oh crap I think Lelouch turned things worse.

Now Relius has Lelouch and is curious on Geass and began ripping into his mind and try to find the Collective Unconscious to gain a Geass or maybe a Code to gain some form of immortality. Plus Relius' own mind hax is greater than Lelouch's mind hax so he could turn the tables and mind screw Lelouch and turn him into his puppet. Now Lelouch would want to take over the N.O.L but the problem is Izanami, Terumi/Hazama and Relius who have high mind hax resistance.

Lelouch takes over the world