If you are not aware of this, there is an awesome song on Youtube that lists every single Generation One Transformers character to appear in seasons one, two, three, and four of the original cartoon, as well as some from the Headmaster cartoon. Basically, its every character that was available as a toy in 1984, 1985, 1986, and 1987, who also appeared in the show.

However, some characters are excluded, but that was either due to the time the video was created, or if the character didn't appear in the show.

Check this video here. For those wondering, the tune is the Mexican Hat Dance.