Not sure where this image is from, but one exactly like it can be found-
At DLsite
At the author's website

It is a 3D desktop buddy occasionally spouting some lines, both voice and text. Can look in the direction of your cursor, be angled one way, and positioned/resized anywhere on screen. You can poke the buddy in a few places, and mute them. The buddy takes priority as foreground in most cases.
Full package includes Backbeard, Beako, and a lemon with a face drawn on it. Demo includes voiceless Backbeard.
Works fine for me but it's entirely in Japanese, so I don't suggest it to those who can't interpret it.