- " Mister Boots, why'd you have to do me that way?! I only wanted to grow you some tiger stripes, but that wasn't enough for you!"
- ―Oscar Calraca[src]
Mr. Boots was one of Oscar Calraca's cats that he had smuggled in. Oscar fed it ADAM and was forced to kill it when its addiction drove it to steal some of his ADAM. Oscar claimed he was just trying to grow it "tiger stripes," and that he would "grow claws in your (Mr. Boots') honor." It is mentioned in his last Audio Diary, "Eulogy for Mr. Boots."