I have used wooden peg dolls - they are very cheap and can be made into anyone, and wood is a natural material so, also good. You can always put a drop or two of an essential or holy oil into the paint, sort of blessing them.
I have had to do this pretty much because I have a personal pantheon that no one would ever have statues for. Making your own can be a spiritually rewarding activity anyway, even if some are available to purchase.