Donny Rottweiler is an antagonist in The Replacements. He is a bad bully who is much taller than Todd, but still attends his school. He is Buzz's mentor and Todd's other nemesis, he is afraid due to his large size and makes his last appearance in "A Tale of Two Rileys".
- In the episode "Master Pho", it's revealed that Donny wears Unicorn boxer shorts.
- In the episode "Crushing Riley " it's revealed that Donnie has a tracking device on his leg and is not able to leave the county line.