How to say "weirdo" in Japanese

• 変人へんじんCommon
  nounThe straightforward 'weirdo': a person whose behavior or ideas seem strange to those around them. It can sound critical, as when describing a neighbor with genuinely bizarre habits.
  多おおくの科学者かがくしゃは世間せけんに変人へんじん呼よばわりされている。↗

  Many scientists have the reputation of being eccentric.
• 変わり者かわりものCommon
  nounThe same sense but with a lighter, often affectionate tone, close to calling someone 'a character'; it suits describing a friend's quirky habits without really criticizing them.
  あいつはなんて変わり者かわりものだ。↗

  What an oddball he is!

Both translate 'weirdo' for a person whose habits or ideas are odd: 変人 is the plainer, potentially critical label, while 「変わり者」 often carries a lighter, fond nuance, close to calling someone 'a character'.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 変人へんじんeccentric
• 変わり者かわりものeccentric
• 異常者いじょうしゃdeviant