It's time to go full samurai autist again.
Everyone knows about samurai helmets and how ornate they are, but the core designs became much simpler and more utilitarian in construction during the late Sengoku period, which is why you got more of the wackier designs that people associate with them nowadays. The function of the ornamentation on the helmets was similar to the function of a personal coat of arms that European nobles had on their shields - to easily distinguish the commanding officers on the field, and even today the more famous designs are still associated with the samurai that wore them. Most of those ornaments, while looking metallic, were actually mostly made out of light materials such as lightweight wood which was lacquered in such a way to make it seem metallic. As such, they were easy to replace should they be damaged, it is said that Date Masamune's famous crescent moon on his helmet was made in a way that if someone tries to capture him or use it against him in battle by grabbing it for example, it would easily break off from the helmet.
Here's some examples, either famous ones or my personal favorites and some which aren't my favorites but had interesting designs just to show off the diversity on display.
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As mentioned earlier, Date Masamune had an asymmetrical crescent moon ornament on his helmet, it is probably one of the most recognizable designs today when people think of samurai helmets.
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Naoe Kanetsugu, a loyal retainer of the Uesugi clan, first serving as a page under Kenshin, one of the most famous warlords of the era, and later as strategist and advisor of Kenshin's adopted son and heir, Kagekatsu. The symbol on his helmet is the word "Love".
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Toyotomi Hideyoshi was one of the three great unifiers of Japan and his helmet is probably the most striking one out of the three, it is shaped in the style of the crown Ming dynasty dignitaries wore, with the ornamentation on the back representing the leaves of the Iris flower
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Satake Yoshishige was a powerful warlord and one of the big players in the Kanto region. The wild ornament on his helmet represents a hairy caterpillar.
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Vikings may not have actually worn horned helmets, but samurai sure as shit did, this one is Fukushima Masanori's water buffalo helmet. He distinguished himself as a powerful warrior under the service of Hideyoshi. His helmet was originally owned by Kuroda Nagamasa, but Nagamasa had multiple of that style of helmet made and gave one of them to Masanori. Nagamasa is more famously known today to have worn a different style of helmet, speaking of...
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Bruh... looga dis dood... uhuhu... wait until you see the... uuuu... ONONONO OHOHO, OOOOOO
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PFAHAHAHAHAHAHA OH LOOK AT THE TOP OF HIS HEAD!!! PFAHAHAHAHAHA!!! LOOK AT HIS LIPS!!!
Seriously though, the helmet is supposed to symbolize the victory at the battle of Ichi-no-Tani during the Genpei war where the Minamoto clan defeated the Taira clan in a siege on their previously thought unbeatable fortress.