How do you switch party members in Mass Effect?

Answer 1

You are allowed exactly two party members in "action zones / missions " (I.E. Everywhere except the Normandy)

At the beginning of each mission you see a menu showing the silhouettes of each of your available party members (Garrus, Liara, Wrex, etc.) at this menu push the X button to highlight two party members, and then press the A button. A prompt will appear confirming your selection.

You cannot change party members mid-mission unless you acquire a new one. Then the menu stated above will appear in case you want to swap in your new ally. NOTE: In case you didn't know, you can change the equipment of your party members at each of their lockers on the Normandy. They are located on the left wall of the lowest level.

Answer 2

if your on the xbox tou press the black button during the battle and when walking around

Answer 3

You can switch characters in FF7 on the world map or at a save point by choosing the USP option in the menu.