Turn yourself into an SD character effortlessly with Takara Tomy’s Dodeca Head. It’s a series of oversized inflatable helmets in a variety of styles. There’s a samurai, a geisha, a knight and a girl with pig tails.
Here’s a demo by YouTuber タケトファミリースタジアム:
You can order the helmets from Hobby Link Japan for around $17 (USD) each. The store also lists three more upcoming styles: a ninja, a kabuki and a pharoah.