We scare, because we care.
~ Monsters Inc.'s slogan
These are monsters who fight on the side of good, being the opposite of villainous monsters such as Mechagodzilla. Usually, Heroic Monsters are often misunderstood by humans, because they think that they are vicious man-eating creatures, so they avoid them because of this. But in actuality, they are very friendly and gentle and would never hurt anyone except out of rage and fear. Usually, there is always a human hero/heroine who realizes that the monster isn't really bad and tries to make the other people accept them for who they are. Sometimes they will even fight against evil monsters in order to protect the humans.

Examples of "friendly" monsters: