Hey, this may be an odd question...

Is there anything that keeps one figure from outwitting, perplexing, or probability-controlling when an enemy figure is adjecent to them, so long as the first figure still has clear line of sight to another enemy? For example, starter set joker is adjacent to Batman, but Batman can still "see" Darkseid 2 to 10 squares away--any problem outwitting him?

Thanks!

No, as long as you can 'see' the figure, you can do it.

No issues with the scenario that you gave.

The typical hang-up with this is that the rulebook specifically says you can't make ranged combat attacks (which require LOF) when you are adjacent to an opposing figure.... but that doesn't mean that all LOF requirements can't be used when you're adjacent.