As already mentioned on the main page, these games tend to be Strictly Formula and, as a result, many characters fall under specific archetypes and many organizations and locations will have some similarities. See also this and thisIn a nutshell, if it's a BioWare game, expect to encounter the following during the course of the game:
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The Heroic CharmerThis character is almost always the male lead and usually be one of, if not the most important party member relevant to the plot. He's almost always a Love Interest for the female (and sometimes male) Player Character. A charming, heroic, handsome gentleman with a sense of humor, he's almost always an example of Single Woman Seeks Good Man.
The SweetheartThis character is always female and will always be the most optimistic of all your party members. It's likely that she's a Love Interest, and is always beautiful and youthful. She tends to be kind, sweet, gentle (but of course an Action Girl, as befits the party members). The Betty to the Defrosting Ice Queen's Veronica.
The Proud, Honorable WarriorMost likely the brute force on the team, this character embodies the fighting spirit and is proud of it. Capable, tough, fierce, and always honorable this character can have a lot of personality variations, but is encapsulated in their love or skill of battle and combat and the pride they take in it. In a fantastical setting, this character is probably a different species (and a Proud Warrior Race Guy), whose culture glorifies combat and warriors.
Blood-thirsty Comic ReliefThis character frequently expressed a desire to kill people, and is probably not even a person itself. Either that, or they booze themselves up so much they enter a inhuman frenzy. Nevertheless, this character is also resistant to quitting the party, as their comic half makes them a "low-stress" character for the player.
The MentorPretty much doomed to die at some point, this character has taught you what you know, or is the respected leader who might induct into the Secret Organization you find yourself in. Wise and proud, this (often male) character will guide you on your journey. They are usually not a party member.
Organizations and Places
The Doomed Starting AreaIt is not necessarily the hometown, but it is doomed nonetheless.
The Player Character's Special OrganizationThis organization is either above the law in some way, or is otherwise able to provide special resources to the player character. The player is inducted in to the order, which gives them the right to do all the nosy, murderous things they usually do.
The Lost WorldThe location of the Lost Technology of the Precursors, conveniently forgotten by modern civilization. Either the place of the final showdown with the Big Bad, or a key to reaching it.
The Party HeadquartersWhere the party members rest between missions and hand out their personal quests to the player. Has a high probability of being attacked at some point.