B1 and B2 are the main protagonists and twins of bananas, which they were fruits of bananas, and the main characters of the show. They are exaggerated and naughty; and when they have a problem, they somewhat bump into each other (though a boing of a spring was heard in the original series), and after that, they say their catchphrase:
B2: Are you thinking what I'm thinking, B1?
B1: I think I am, B2!
They love to spend lots of time with the teddies (Morgan, Lulu, and Amy) on doing various activities, such as playing, working on the farm, and telling stories. But with Rat-in-a-Hat, they sometimes don't get anything with, or don't listen to him, especially in Rat's shop which makes him very upset. Anyway, they are fun-loving and friendly.
The original series
B1 and B2 appear as yellow bananas with beady oval eyes and smiles and wear blue-and-white striped pyjamas with buttons and yellow and black shoes. Although they are twins, they have different voices. B1 is also the smarter of the two, while B2 is rather dumb.
The animated series
In the animated series, they appear slightly different from their costumed versions. They have blue eyes, eyebrows, small dark-toned cheeks, lips, teeth, and tongues, and wear gold shoes. However, they still retain their trademark pyjamas.