It's convenient if your usual appearance is not too distinct and not well known, but Kanzashi is far from that. OTOH putting a wig on Ichika and you may mistake him for Chifuyu.
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Alternate History wank time!
Due to certain shift of culture with the appearance of aliens, many things had changed during the history of earth, mostly from 1000 AD onward.
Rito and Dan both have Scottish lineage (10% of the population are red haired, and well
over 25% carry the genes) due to large population of European people stranded in Hokkaido in 18-19th Century (while IRL Japanese are seriously xenophobic during that timeframe), Saruyama's case however more or less normal European-born Japanese, traced back to WWII.
Len already split with Lun during the birth process because
all the people from his planet migrated to Australia decades before the continent is used as prison land, and thus they learn to adapt with much more stable environment of Earth. (For them, super deadly Australia is outright paradise) Therefore, most of Australian is in fact hardcore human alien, with distinct white hair being majority, and all of them have half-identical twin
