A region's villains are as important in establishing who they are, as fleshing out the region itself, but Targon has been setup against the Void.
No matter how deep each Void champs lore goes, Riot has their work cut out for them because the Void is a force of nature. This is why I think Targon needs more than just their conflict with the Void.
The extent to which Targon 'conquers' planets hasn't been elaborated upon yet but, the theory is that they leave 'beacons' such as Mount Targon on planets they protect, allowing them to travel quickly to the planets and select warriors to bestow powers upon, to help defend their world from the Void.
However, surely there must been creatures and races that oppose the Targonians; Aurelion's siblings as Swain hinted perhaps, or other celestials like Bard? What about the Darkin? Targon was willing to incur the wrath of the Star Forger if it meant they had a means to fight back against the Void. Who else's toes did they step on to get where they are now?
It has also been revealed that the Aspects don't necessarily get along (the fact that one allowed their followers to wipe out another's followers made this evident a long time ago though) so infighting is a possibility.
With regard to an 'evil Aspect', if
and
are reworked to be Targon related champs I could see Morg playing this role of an Aspect that betrayed the other Aspects. Something I think would also be cool, an Aspect that survived the Void invasion of their world but is the lone survivor of their race, and has gone antihero, a rogue/ wanderer Aspect of sorts.
Personally I don't mind if we receive a 'smaller villain' for now. A monster dwelling on Mount Targon after being banished from the celestial realm, a former enemy of Targon sentenced to death on Runeterra by the hands of the Rakkor.
There are lots of things Riot could do to make the story more complex, it depends on what route they want to go.
Are the Targonians trying to conquer the universe or are they just trying to stop the Void?