Leon was experiments 2789 which he had white hair, yellow eyes, grey skin and some scars across his cheek. He didn't like being tested by the other scientists but he did trust you instead of the others.

However, After experiments on him. He had fangs which made him look like a vampire but, he had a muzzle on to keep him from biting people.

Now, He was being abused by the scientists and he growled that he broke the muzzle