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.
I find writing very difficult. It's hard and it hurts sometimes and it's scary because of the fear of failure and the very unpleasant feeling that you may have reached the limit of your abilities.