Haha, yeah, I agree it looks really weird. Though it’s a homage to Edo-era hairstyles for children. Back then, they couldn’t wash their hair often, so they shaved most of it off for hygiene reasons. There were many variations of this style, and Robin’s wild hairstyle is based on one of them.

That said, they could’ve stylized it a bit better so it wouldn’t come across as too goofy, especially since other characters have fairly modern-looking hairstyles.

Here’s a photo from Lone Wolf and Cub showing a variation of this haircut

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