Anyone have an idea what this is all about?

Here's what he said about this image on pixiv:
かなり楽しくなってきたので引き続きゲーム風のオリジナルを描いてみました。この子は男の子でピコといいます。金髪と帽子が描いてて楽しいです。

I really started to enjoy drawing this game-style original, so I finished it in one sitting. This guy is a boy and is called Pico. The blonde hair and cap were fun to draw.

Or something like that.