Do light side leader abilities work on dark side characters? It doesn't seem like they do. How about with ships? Do light side capital ship abilities affect dark side ships?
They will unless the leadership ability specifically limit to a certain faction. For example, Old Ben's lead affects all toons in the group, regardless of faction. Bastila Shan's lead, however, specifically states that it is only affecting jedi in the group.
You'll also find some leaderships will affect all allies, but certain factions gain a bonus. For example, Tarkin's capital ship has bonuses for all ships in the group, but Empire allies gain a significant bonus.
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You'll also find some leaderships will affect all allies, but certain factions gain a bonus. For example, Tarkin's capital ship has bonuses for all ships in the group, but Empire allies gain a significant bonus.