• Pepper was the first creature to be successfully created combining the DNA of various different animals
• He was actually seen as a failed attempt due to his positive and kind nature, he was not the weapon of war the government wanted.
• Nia helped free Pepper and in a haze of fear Pepper attacked her giving her her facial scars
• During one of his aggressive episodes he ends up killing a load of his blue butterfly companions 

He was a lab experiment which was created to see if it was possible to merge aspects of several different animals together. He was the first successful outcome of this type of experiment, before him there had been many failed attempts. If the experiments were a success the scientists had agreed to create more to form an unstoppable army. However, Pepper was not what the scientists or the army was hoping for, he didn't appear strong enough to actually take on wars. He also still contained a soft and friendly side in his personality which wasn't ideal. So they locked him up in a cage and continued experimenting to make better and strong versions of Pepper. Whilst being locked up Pepper forms an obsession about wanting to be free and experience the outside world. He has a tiny barred window in his cell which he would spend hours if not days just staring out of it. During this time he is also experimented on more to try and make him more of the successful outcome they wanted. These experiments lead to Pepper developing a very aggressive and ruthless streak which is unpredictable and dangerous. Knowing he is ultimately a failure for what they wanted they leave him locked up in a very high security cell.

Pepper does get freed accidentally, however he gets out he can't remember everything for him goes into a blur. He is in fact freed by Nia when she escapes but his other personality takes over and attacks her before fleeing the lab. When he gets loose he flies to the nearest forest to hide, in the days that follow he gradually moves further and further away so it's harder for him to be tracked down. He ends up living in the forest at the foot of a mountain range so he can escape up the mountains if necessary. 

In the wild Pepper ends up realising he has no survival skills what so ever and has to try to learn and adapt as quickly as he can so he doesn't die. He ends up finding Bagel who lives in the mountains and he teaches him a lot and helps him learn how to be independent.