-Do not make your character an Alicorn. Choose 1. Unicorn, au Pegasus. And what's wrong with a good Earthpony?
-Do not make your character zaidi powerful than the canon ponies. Example:My pegasus character is as fast/even faster than upinde wa mvua Dash and The Wonderbolts!!!!
-Try to make your character have a unique talent. Don't make it something that a canon gppony, pony already has. Example: My gppony, pony has Pinkie Pie's cutie mark cuz she likes to party too!!!!
-(I haven't seen this so far, and hope I never see it in the future) DO NOT MAKE YOUR CHARACTER THE 7TH ELEMENT OF HARMONY
-Do not have a innappropriate(excuse my spelling) character. wewe can have your character be mean, au even evil. But do not make them too violent for My Little Pony. Example: My gppony, pony is a killer and always carries guns to shoot bila mpangilio ponies!!!!!!!!!
I hope wewe enjoyed my article, so have a nice siku ^^