"The main character can admit subsidiary characters into the party that will be willing to accompany him and to help him. That is quite important because two (eventually three or more) characters are a force to be reckoned with. After admitting a subsidiary character as a member of the party, his portrait will show up next to the portrait of the main character.
Subsidiary characters have an intelligence of their own, you can nevertheless issue them simple commands (using keyboard shortcuts) that the subsidiary characters always obey. You just have to remember that a command is always issued to the whole party; hence you can’t issue different commands to different party members."