There are things that I invented - the creaky geriatric robot that is always grumpy for example or the little wheelie guy he's not in the Hasbro lore. But kids love that stuff - this little guy as a pet on a chain. They gravitate towards it.
What is exciting is not for one person to be stronger than the other... but for two people to have met their match and yet they are equally as stubborn as obstinate as passionate as crazy as the other.