he's cute and thank u for giving him a chance at a good life. however, i would question the dwarfism and him being a Banana. he's got rolls, so he's either chubby or going into shed. if he were a dwarf, i would assume u would not be able to tell until u have had him for quite some time (like years) and he remains small. (or if he's proportions are all funky - like big head, small neck/body, etc.)
also he's really high yellow. an Albino Banana would look like a normal Albino. i think u might have an Albino Champagne, Albino Pinstripe or Albino Spider. your boy doesn't have enough white or pattern. what was the pairing that produced him? i think the breeder and/or petshop misidentified him. it happens.
anyway post more pix and keep us update on the cute lil guy.