Blueberry!!

Difference between Blue and Swap (also fun fact): Swap is dark blue, taller, chubby, and is still Papy's older brother, and his bandana ends in a cape-kinda style. Blue is similar to his drawing and is sometimes drawn/implied to be Stretch's' (Honey, carrot, etc etc) baby brother. He wears a bandana with trails and he's coloured Cyan! (Usually drawn with starry eyes). Other FanonSwap Sans designs can have either or both traits but Blue is the most popular!