Many television commercials for Cheerios have targeted children, featuring animated characters (such as a Honeybee).
Bullwinkle was featured in early 1960s commercials, with the tag line at the end of the ad being "Go with Cheerios!" followed by Bullwinkle, usually worse for wear due to his Cheerios-inspired bravery somewhat backfiring, saying "...but watch where you're going!"
Hoppity Hooper was also featured in ads in the mid-1960s; General Mills was the primary sponsor of his animated program.