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A Good Guy is someone whose greater principles do the same. A typical example might be a Justified Criminal forced to go native among real criminals, perhaps because of deliberate persecution or simple error by The Government.
Despite his high moral standards, he is not listen to in the party, as he may not be interfering with their questionable activities. Though he can be, reminding the others (or teaching them for the first time) that there is more at stake than money, power or personal vendettas. Alternately, he may be someone who simply holds himself aloof from the "debauchery" of other party members. In extreme examples, he may become disliked by his own allies as he tries to foist his ideas on others, becoming a terribly annoying Commander Contrarian.
He will likely have struggles between loyalty to the True Companions and his conscience, creating inner conflict and conflict with his teammates, but sometimes a Good Guy can also inspire the team to rise above themselves by the idealism they show.
If both he and the Evil Guy are in the same party (and you know authors won't want to miss the chance) there will be at least one huge display of verbal fireworks per episode.
Alternatively, though, a Good Guy can be found amongst a group of dastardly villains, in order for the show to make sure that the antagonist side does not go too black in terms of morality. Perhaps this character shows restraint in doing atrocious evil, or is forced against his/her own will to be a bad guy (due to a hostage or some other leverage held by the bad guys, for example), or has other goals that are noble, but require him/her to be on the bad guys' side, or is merely just following orders from the higher ups that he/she has sworn loyalty to (high honor standards can cause such). This character has a high chance to become a sympathetic Anti-Villain that the audience can root for. They may also be well liked by virtue of not being an jerk. The other members will trust him more than each other and have him talk to the people when needed.
Sometimes they are part of a team filled with not-so-clean heroes who are not in for helping people or promoting justice, but minding their own business
He might be a ridiculously strong person with the temperament and intelligence of a young boy. Throughout most of the series, he's reliant on his "keeper" to do the thinking for him (his main input being to ask her if he can eat). When she dies, the poor guy suffers a nervous breakdown. In the end he's just hungry, completely unaware of concepts like morality and has no idea that what he's doing is wrong
He is pretty much the only one among them who is nice, not a sociopath, and has standards. Also, unlike the others who resent humans and treat them like expendable pawns, He will welcomes followers of any kind and greatly cares for them
He might of sided with the bad guys because he wants to protect his family and people of his homeland
He might also a double agent working for the Revolutionaries, the Authorities, the Heroic Antagonist, The Big Good or The Good Guys
He also might sacrifice himself to save one of the Heroes while at the sametime greatly damaging the Big Bad from the inside.Music for the Second Half of the Article
Here are Some Examples: