I found a great app for making your own characters and other creations for your projects!
It's called Assembly.
There are so many options and it's really easy to use. You can easily make characters and objects and all sorts of things! You can also save your images with an invisible background. You should deffinetly check it out. It's free!
You don't have to be an artist. There's no drawing needed! Just connect shapes to create anything you want! I hope this is helpful to you and your projects!