LF Bot that Rolls an outcome based on Percentage?

Could possibly be a modified DnD dice roller, since those are technically percentages.
Creating a game-based server for Path of Titans, and I'd like to have a channel dedicated to rolling for skins based on inputted parents' skins (normally 50/50 chance, but a smaller chance to roll recessive skins if they are inputted), or a small percentage to roll a mutation like melanism, albinism, blindness, etc.

If anyone knows any that currently exist, or have any tips for how I could create a bot to do so/get one made, I would be super grateful!!