Ursus

Ursus is the Union that leads over Daybreak Town itself.. Of course, leadership isn't their only thing. They're also the masters of espionage, psychological analysis.. And secrecy at a practical level, and thus, are the Union who takes on those roles as well (we do the more technical aspects, like cryptoanalysis, but codes? Charisma? That's all Ursus.)

So if, say, Unicornus, discovers an organization that, unlike us, actually sides with the Darkness.. Ursus will be the Union that sneaks around and gathers intel.

This actually tends to show when they fight Heartless as well-They have been known to use sneak-attacks and the like.