The Bun Bun skin is an Epic Fortnite outfit. Bun Bun was available via the Item Shop for 1500 V-Bucks and you can buy it from Fortnite Item Shop when it will listed.
Fortnite Bun Bun Skin Details
If you see him coming you'd better run run.
Fortnite Bun Bun Skin PNG Images
Here is the PNG images of Bun Bun below!