Bottles is a shortsighted mole who teaches Banjo and Kazooie abilities throughout Banjo-Kazooie. He was Tooty the Bear’s closest friend in Banjo-Kazooie and the only eyewitness to her kidnapping by the wicked Gruntilda.
Note that the eyes seem to be really fiddly. There are instructions with the download, that say that some of the parts of the eyes are optional, so I suggest reading them before starting to assemble 😉
By Frozen_Fish, info from Banjo-Kazooie Wiki