Isabella Fibonacci is a fan character of T.U.F.F. Puppy. She is as smart as Keswick and is Connor's assistant. Main article: Isabella Fibonacci Page at T.U.F.F. Puppy Fanon Wiki Retrieved from "https://cartoonfancharacters.fandom.com/wiki/Isabella_Fibonacci?oldid=5069" Categories: Females Characters T.U.F.F. agent T.U.F.F. puppy fanon Fanon Fanfics Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.