[@floodtalon][@The 42nd Gecko][@Lucius Cypher][@Awesomoman64][@Lonewolf685]

Knowing some general notes about the others' secret tactics is possible (things like spies, legends and info leaks, exist after all) but precise information about their capacities is not able to be acquired unless they are used, or you can extract the info during the battle.

Think of it kinda like a NP on of the Fate Franchise and you'll be on a good trail.