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The forepart of the game finds you alone, however soon new companions will join you and aid you in your quest. The new party members aren't limited to humans only but can vary from druids to Mandalorians. Each character has some distinct abilities (i.e. stealth for Atton, destruction of the force fields for Bao-Dur, etc) and their correct coalition between the party members, helps in the creation of a powerful team. You shouldn't try to create the perfect character but to increase each character's strong points every time you gain a level (It is also prudent to have at least a member with high persuasion skills. This will save you from many troubles and money!).
Moreover, using your main character, you have to try to keep the balance between your party members. There are disputes, compassions and dislikes between your companions (a feature first appears in the Baldur's Gate series) and you have to keep them from exceeding the limits. Finally, your personal behavior towards each of your comrades will determine the gain or loss of influence points. The more influence points you have, the easier the support for your actions from your comrades (which lead to the Light or the Dark side).
Some of your party members...
Some Star Wars KOTR2 screenshots