Oh, I totally understand.
From a gamer's PoV, I'm curious to see how three characters on the same class will end up being unique, on paper at least. :)
The 7 different lightsaber forms are actually philosophical ideologies that you can ascribe to. This can lead to quite a varied characters even with the same class.
Form I: Shii-Cho. Relies on disarming opponents than just killing them, and is more of a passive philosophy catering to the Jedi Code. But it is weak towards lightsaber vs. lightsaber combat since it was invented before such combat even existed.
Form II: Makashi. Proper Duelist fighting stance that relies on minimal effort to a proper defense, while exploiting enemy defensive openings and counterstrikes. It was designed to be a counter to Form I.
Form III: Soresu. Purely defensive combat style that relies on a constantly moving blade to parry and deflect both melee and ranged attacks but lacks heavily in offensive capability. More geared towards people who want to fatigue their enemies and try to reason with them, not to strike them down.
Form IV: Ataru. The acrobatic style of lightsaber combat, best employed in open spaces against a single opponent. An all offensive style that relied upon surrendering to The Force to go beyond physical limitations. Very aggressive form of combat.
Form V: Shien / Djem So. A upgrade from Form III that took defensive strikes and flowed them into offensive attacks. Using it against a opponent and using their own attacks against them, either by blaster shot deflection or altering lightsaber strikes. The form encourages aggression and domination.
Form VI: Niman. Takes a generalized step out of the previous forms and melds them into a single form that has no overall strength or weakness. Instead it relies on Force Powers to disrupt and defeat your enemy. Using Telekinesis and mind altering to distract and slow your opponent instead of using elaborate lightsaber technique.
Form VII: Juyo. The single most aggressive lightsaber style, where it employes chaotic and aggressive strikes to wear down your foe in expense of defense. Jedi frown on it since it is too aggressive for those whom desire peace and tranquility in their lives, but Sith rely on it heavily.