If you choose the good side while playing The Third Age Game Boy Advance version, you get to choose from 3 differnt generals: Gandalf, Aragorn and Elrond. Gandalf
Known as the most powerful wizard to ever grace the earth, Gandalf joins your team in fighting as Gandalf the Gray. Because you have no choice in the matter of whether he dies or not, when he does die and becomes Gandalf the white, all the better for you! Gandalf the White is truly an asset to your army if you choose to play as him. Aragorn
Aragorn, King of Man, ranger of Ithilien and really good fighter is, of course, also quite an asset. Aragorn is proficient in skills ranging from fighting with swords, bow and arrow and several other weapons, to talking in several different languages. Aragorn truly shows his skills in the books, and he should show likewise in the game. Elrond
Elrond is a prince of elves and master of Rivendell. His power exceeds that of most other elves, and his determination and skill in combat is unmatched. He should be an extremely valuable asset to your party.